Short Curriculum Vitae
Research Interests
Principal Publications

Constantin Popa



e-mail: cpopa@univ-ovidius.ro

Short Curriculum Vitae

 born October 10, 1956 in Bucharest, Romania; widower, one child
1981 - Diploma in Mathematics at University of Bucharest, Romania
1995 - Doctorate (Numerical Analysis) at University of Bucharest, Romania
2000 - Full Professor on Applied Mathematics at Faculty of Mathematics and Computer Science, "OVIDIUS" University of Constanta, Romania; since 1998 - Head of Department of Computer Science and Applied Mathematics
2001 - Scientific researcher III (half-time employment), "Gheorghe Mihoc - Caius Iacob" Institute of Mathematical Statistics and Applied Mathematics, Romanian Academy of Sciences, Bucharest

Memberships

since 1992 - GAMM, Germany
since 2008 - SIAM, USA
since 2003 - GAMM Group on Numerical Linear Algebra
since 1990 - Romanian Society of Mathematics (SSMR)
since 2001 - Reviewer at Zentralblatt fuer Mathematik, Germany
since 2000 - International Linear Algebra Society (ILAS), USA

Research visits (more than one month)

December 1, 1992 - January 31, 1993 - DAAD grant at Institute for Informatics and Applied Mathematics, University of Kiel, Germany
September, 1996 - August, 1997 - postdoc grant at Department of Applied Mathematics and Computer Science, Weizmann Institute of Science, Israel
April 1 - June 30, 1998 - postdoc DAAD grant at Institute of Mathematics, University of Augsburg, Germany
October 1, 2002 - August 31, 2003 - visiting professor (DAAD Gastdozent) at IMMD 10 (Systemsimulation), University Erlangen-Nuernberg, Germany
Decembber 1, 2005 - January 31, 2006 - visiting professor (DAAD Research grant) at IMMD 10 (Systemsimulation), University Erlangen-Nuernberg, Germany
July 1 - August 31, 2009 - visiting professor (DAAD Research grant) at IMMD 10 (Systemsimulation), University Erlangen-Nuernberg, Germany

Research interests

 - image reconstruction from projections in computerized tomography
- iterative methods for least-squares formulation of linear systems of equalities and inequalities (projection and multigrid algorithms)
- inverse problems: regularization techniques and methods for numerical solution of first kind integral equations
- preconditioning techniques for finite element and finite differences discretizations

List of most important scientific publications

Books

  1. Popa C., Pelican E., Introduction to numerical analysis (in romanian), Editura MatrixRom, Bucharest 2005 (150 pages); ISBN 973-685-991-6
  2. Popa C., Iterative methods for linear least-squares problems, Series ''Monografii Matematice'', vol. 77, West University of Timisoara, Romania, 2003 (118 pages); ISSN 1453-7702
  3. Popa C., Preconditioning techniques for linear and nonlinear problems, PAMM Monographical Booklets, vol. MB 4, 1997 (80 pages); ISSN 1417 278x
  4. Juncu Gh., Popa C., Introduction to multigrid methods (in romanian); Editura Tehnica, Bucharest, 1991 (192 pages); ISBN 973-31-0309-8

Papers in ISI journals

  1. Juncu Gh., Nicola A., Popa C., Nonlinear multigrid methods for numerical solution of the variably saturated flow equation in two space dimensions, published online in Transport in Porous Media, DOI 10.1007/s11242-011-9831-9, 07.09.2011; ISSN 0169-3913; Relative Influence Score (RIS) - 1.60
  2. Nicola A., Popa C., Rude U., On a regularization technique for Kovarik-like approximate orthogonalization algorithms, Carpathian Journal of Mathematics, 27(1)(2011), 114-122. ISSN 1584-2851.
  3. Nicola A., Petra S., Popa C., Schnorr C., On a general extending and constraining procedure for linear iterative methods, accepted for publication in Intern. Journal of Computer Mathematics. ISSN 0020-7160; RIS - 0.35;
  4. Koestler H., Popa C., Preclik T., Ruede U., On Kaczmarz's projection iteration as a direct solver for linear least squares problems, Linear Algebra and its Applications, 436 (2012), 389-404. ISSN 0024-3795; RIS - 0.98;
  5. Popa C., Extended and Constrained Diagonal Weighting Algorithm with application to inverse problems in image reconstruction, Inverse Problems, 26 (2010)(17pp), published online, DOI: 10.1088/0266-5611/26/6/065004. ISSN 0266-5611; RIS - 1.83;
  6. Popa C., A hybrid Kaczmarz - Conjugate Gradient algorithm for image reconstruction, Mathematics and Computers in Simulation, 80(12) (2010), 2272 - 2285. ISSN 0378-4754; RIS - 0.91;
  7. Juncu Gh., Nicola A., Popa C., Nonlinear multigrid methods for numerical solution of the unsaturated flow equation in two space dimensions, Transport in Porous Media, 83 (2010), 637-652; cited in C29, C30. ISSN 0169-3913; RIS - 1.60;
  8. Popa C., Iterative Solvers for Tikhonov Regularization of Dense Inverse Problems, Intern. Journal of Computer Mathematics, First published on 16 August 2010 (iFirst); DOI:10.1080/00207160902971558. ISSN 0020-7160; RIS - 0.35;
  9. Juncu Gh., Nicola A., Popa C., Udrescu T., Nonlinear multigrid methods for solving Richards’ equation in two space dimensions, Carpathian Journal of Mathematics, 25(1)(2009), 82 - 91. ISSN 1584-2851.
  10. Nicola A., Popa C.,, Sparse matrix techniques in scientific computing, Studies in Informatics and Control, 18(1)(2009), 33-38. ISSN 1220-1766.
  11. Popa C., On Cimmino's reflection algorithm, Proceedings of the Romanian Academy, Series A, vol. 9, No. 1, January-April 2008. ISSN 1454-9069.
  12. Popa C., Constrained Kaczmarz Extended algorithm for image reconstruction, Linear Algebra and its Applications, 429(2008), 2247 - 2267. ISSN 0024-3795; RIS - 0.98;
  13. Popa C., Algebraic Multigrid Smoothing Property of Kaczmarz's Relaxation for General Rectangular Linear Systems, Electronic Transactions in Numerical Analysis (ETNA), 29 (2008), 150 - 162. 1068-9613; RIS - 0.79;
  14. Mohr M., Popa C., Numerical solution of symmetric least-squares problems with an inversion-free Kovarik type-algorithm, Intern. Journal of Computer Mathematics, 85(2)(2008), 271-286. ISSN 0020-7160; RIS - 0.35;
  15. Popa C., On numerical solution of arbitrary symmetric linear systems by approximate orthogonalization, Mathematics and Computers in Simulation 79(4)(2008) 1033 - 1038. ISSN 0378-4754; RIS - 0.91;
  16. Popa C., Udrescu T., A fast solver for magnetostatic field problems, Romanian Journal of Physics, 52(3-4)(2007), 237-249. ISSN 1221-146X.
  17. Juncu Gh., Mosekilde E., Popa C., Numerical experiments with MG continuation algorithms, Applied Numerical Mathematics, 56(2006), 844 - 861. 0168-9274; RIS - 1.12;
  18. Petcu D., Popa C., A new version of Kovarik's approximate orthogonalization algorithm without matrix inversion, Intern. Journal of Computer Mathematics, 82(10)(2005), 1235-1246; cited in C22 ISSN 0020-7160; RIS - 0.35;
  19. Popa C.}, Zdunek R., Kaczmarz extended algorithm for tomographic image reconstruction from limited-data, Mathematics and Computers in Simulation, 65(6)(2004), 579-598; cited in C19, C20, C23, C24, C25, C26; ISSN 0378-4754; RIS - 0.91;
  20. Mohr M., Popa C., Ruede U., An iterative algorithm for approximate orthogonalization of symmetric matrices, Intern. Journal of Computer Mathematics, 81(2)(2004), 215-226. ISSN 0020-7160; RIS - 0.35;
  21. Popa C., Modified Kovarik algorithm for approximate orthogonalization of arbitrary matrices, Intern. Journal of Computer Mathematics., 80(4)(2003), 519-525; cited in C21. ISSN 0020-7160; RIS - 0.35;
  22. Juncu Gh., Popa C., Preconditioning by Gramm matrix approximation for diffusion-convection-recation equations with discontinuous coefficients, Mathematics and Computers in Simulations, 60(2002), 487-506. ISSN 0378-4754; RIS - 0.91;
  23. Evans D. J., Popa C., Projections and preconditioning for inconsistent least-squares problems, Intern. Journal of Computer Mathematics, 78(4)(2001), 599-616. ISSN 0020-7160; RIS - 0.35;
  24. Popa C., Extension of an approximate orthogonalization algorithm to arbitrary rectangular matrices, Linear Algebra and its Applications, 331(2001), 181-192; cited in C21. ISSN 0024-3795; RIS - 0.98;
  25. Popa C., A method for improving orthogonality of rows and columns of matrices, Intern. Journal of Computer Mathematics, 77(3) (2001), 469--480; cited in C15, C21, C27; ISSN 0020-7160; RIS - 0.35;
  26. Popa C., An approximate orthogonalization technique for arbitray rectangular matrices, ZAMM 81, Supplement 4 (2001), S1019-S1020. ISSN 1521-4001; RIS - 0.74;
  27. Juncu Gh., Popa C., Numerical experiments with preconditioning by Gram matrix approximations for non-linear elliptic equations, Mathematics and Computers in Simulation, 52(1)(2000), 53-71. ISSN 0378-4754; RIS - 0.91;
  28. Popa C., A fast Kaczmarz-like solver for linear least squares problems, ZAMM Vol. 80, Supplement 3(2000), S811-S812; cited in C10; ISSN 1521-4001; RIS - 0.74;
  29. Popa C., Block-projections algorithms with blocks containing mutually orthogonal rows and columns, B I T Numerical Analysis, 39(2)(1999), 323-338; cited in C10 ISSN 0006-3835; RIS - 1.54;
  30. Popa C., Extensions of block-projections methods with relaxation parameters to inconsistent and rank-defficient least-squares problems, B I T Numerical Analysis, 38(1)(1998), 151-176; cited in C9, C12, C23, C24; ISSN 0006-3835; RIS - 1.54;
  31. Popa C., Mesh independence principle for non-linear equations in Hilbert spaces by preconditioning, Intern. Journal of Computer Mathematics, 69(1998), 295-318. ISSN 0020-7160; RIS - 0.35;
  32. Juncu Gh., Popa C., Preconditioning by approximations of the Gram matrix for convection-diffusion equations, Mathematics and Computers in Simulation, 48(2)(1998), 225-233. ISSN 0378-4754; RIS - 0.91;
  33. Popa C., Least-squares solution of overdetermined inconsistent linear systems using Kaczmarz's relaxation, Intern. Journal of Computer Mathematics, 55(1995), 79-89; cited in C5, C9, C10, C24; ISSN 0020-7160; RIS - 0.35;
  34. Popa C., Preconditioning conjugate gradient method for non- symmetric systems, Intern. Journal of Computer Mathematics, 58(1995), 117-133; cited in C1, C4, C8; ISSN 0020-7160; RIS - 0.35;
  35. Popa C., Mesh independence of the condition number of discrete Galerkin systems by preconditioning, Intern. Journal of Computer Mathematics, 51(1994), 127-132; cited in C1, C8; ISSN 0020-7160; RIS - 0.35;
  36. Popa C., An iterative method for CVBEM systems. Part II: The unigrid method, Advances in Engineering Software, 16(1993), 64-69. ISSN 0965-9978; RIS - 0.85;
  37. Popa C., An iterative method for CVBEM systems. Part I: The Kaczmarz algorithm, Advances in Engineering Software, 16(1993), 61-63. ISSN 0965-9978; RIS - 0.85;

Papers in BDI journals which are not ISI journals

  1. Nicola A., Popa C., Rude U., Projection algorithms with correction, accepted for publication in Journal of Applied Mathematics and Informatics.
  2. Nicola A., Popa C., Kaczmarz Extended versus augmented system solution in image reconstruction, ROMAI Journal, 6(1) (2010), 145 - 152. http://www.zentralblattmath.org/zmath/en/journals/search/
  3. Nicola A., Popa C., Constrained Jacobi projection algorithms for image reconstruction, Scientific Bulletin of the Politehnica University of Timisoara, Series Mthematics, 55(69), Fascicola 1 (2010), 42 - 55. http://www.zentralblattmath.org/zmath/en/journals/search/
  4. Nicola A., Popa C., Preconditioning by an extended matrix technique for convection-diffusion equations, Revue d'Analyse Numerique et Theorie de l'Approximation, Tome 37, No. 2 (2008), 181-190. http://www.zentralblattmath.org/zmath/en/journals/search/
  5. Popa C., On a stopping rule for iterative orthogonalization of symmetric matrices, Proceedings on Applied Mathematics and Mechanics (PAMM), 8(1)(2008), 10823-10824.
  6. Popa C., Kovarik's function orthogonalization algorithm with approximate inversion, Revue d'Analyse Numerique et Theorie de l'Approximation, Tome 36, No. 1 (2007), 79 - 87. http://www.zentralblattmath.org/zmath/en/journals/search/
  7. Pelican E., Popa C., Least squares data shape preserving, Carpathian J. Math., 23(1-2)(2007), 165-171. http://www.zentralblattmath.org/zmath/en/journals/search/
  8. Bautu A., Bautu E., Popa C., Hybrid Algorithms in Image Reconstruction, in Proc. Appl. Math. and Mech. (PAMM), 6(1)(2006), 707-708.
  9. Popa C., Petcu D., Petcu M., On Kovarik's orthogonalization algorithm without matrix inversion, Sci. Bull. of ''Politehnica'' Univ. of Timisoara, Trans. on Automatic Control and Comp. Sci., vol. 49(63), no. 2(2004), 223-226. http://journals.indexcopernicus.com/karta.php?action=masterlist; id=4817/
  10. Popa C., A Kaczmarz-Kovarik algorithm for symmetric ill-conditioned matrices, Annals of ''Ovidius'' Univ. Constanta, Series Mathematics, vol. XII(2)(2004), 137-148. http://www.zentralblattmath.org/zmath/en/journals/search/
  11. Popa C., Extended Kaczmarz-like methods with oblique projections, Proc. Appl. Math. and Mech. (PAMM) 2(2003), 491-492.
  12. Popa C., On a modified Kovarik algorithm for symmetric matrices, Annals of ''Ovidius'' Univ. Constanta, Series Mathematics, vol. XI(1)(2003), 147-156; cited in C21; http://www.zentralblattmath.org/zmath/en/journals/search/
  13. Popa C., Supplementary directional relaxations for the acceleration of Kaczmarz's projections method, Revue d'Analyse Numerique et Theorie de l'Approximation, Tome XXXII, No. 1(2003), 99-108. http://www.zentralblattmath.org/zmath/en/journals/search/
  14. Popa C., Some properties and applications of a modified Kovarik algorithm, Bulet. Stiintific si Tehnic, Univ. ''Politehnica'' Timisoara, Seria Matem.-Fiz., tom 48(62), nr. 2(2003), 49-56. http://www.zentralblattmath.org/zmath/en/journals/search/
  15. Popa C., Direct and iterative Kaczmarz-like solvers, Annals of the West University of Timisoara, Series Mathematics, XL(2)(2002), 107-125. http://www.zentralblattmath.org/zmath/en/journals/search/
  16. Popa C., A fast Kaczmarz-Kovarik algorithm for consistent least-squares problems, Korean J. Comp. Appl. Math., Vol. 8(1) (2001), 9-26.
  17. Pelican E., Popa C., Approximate orthogonalization of linearly independent functions with applications to Galerkin-like discretization techniques, Annals of Bucharest University, Series Mathematics, Anul L(2001), 179-184. http://www.zentralblattmath.org/zmath/en/journals/search/
  18. Popa C., On numerical solution of first kind Fredholm integral equations, Rev. Roum. Math. Pure et Appl., XLV(2) (2000), 305--311. http://www.zentralblattmath.org/zmath/en/journals/search/
  19. Popa C., Preconditioned Kaczmarz-extended algorithm with relaxation parameters, Korean Journal on Comp. and Appl. Math., 6(3) (1999), 523-535; cited in C11
  20. Popa C., Characterization of the solutions set of inconsistent least-squares problems by an extended Kaczmarz algorithm, Korean Journal on Comp. and Appl. Math., vol. 6(1)(1999), 51-64; cited in C9, C16
  21. Popa C., Preconditioning for the fulfilment of the approximation assumption in the algebraic multigrid method, Studia Univ. ''Babes-Bolyai'' Cluj-Napoca, 40}(1995, 77-102; cited in C7; http://www.zentralblattmath.org/zmath/en/journals/search/
  22. Golubovici G., Popa C., Supplementary relaxations for the acceleration of a class of iterative mathods, Annals of ''Ovidius'' Univ. Constanta, Series Mathematics, vol. 3(1995), 52-62. http://www.zentralblattmath.org/zmath/en/journals/search/
  23. Juncu Gh., Popa C., Preconditioning by approximations of the discrete Laplacian for non-selfadjoint elliptic equations, Annals of ''Ovidius'' Univ. Constanta, Series Mathematics, vol. 3(1995), 93-105. http://www.zentralblattmath.org/zmath/en/journals/search/
  24. Popa C., A coarsening algorithm for the algebraic multigrid method, Studii si Cerc. Matem., 46(1994), 613-624. http://www.zentralblattmath.org/zmath/en/journals/search/
  25. Golubovici G., Popa C., Convergence study of a two grid algebraic multigrid algorithm for symmetric systems (in romanian), Studii si Cerc. Matem., 45(1993), 139-149. http://www.zentralblattmath.org/zmath/en/journals/search/
  26. Popa C., A note on factorization of symmetric matrices with applications to least-squares problems, Annals of ''Ovidius'' Univ. Constanta, Series Mathematics, vol. 1(1993), 59-64. http://www.zentralblattmath.org/zmath/en/journals/search/
  27. Popa C., On the invertibility of a class of irreducible matrices, Studii si Cerc. Matem., 43(1991), 47-51. http://www.zentralblattmath.org/zmath/en/journals/search/
  28. Paraschiv I., Popa C., Numerical solutions of heat convective transfer equations, Rev. Roum. Mec. Appl., 34(1989), 527-530. http://www.zentralblattmath.org/zmath/en/journals/search/
  29. Popa C., On smoothing properties of SOR relaxation for algebraic multigrid method, Studii si Cerc. Matem., 41(1989), 399-406; cited in C6; http://www.zentralblattmath.org/zmath/en/journals/search/
  30. Popa C., Rounding errors analysis for Jacobi and Gauss - Seidel iterative methods (in romanian), Studii si Cerc. Matem., 39(1987), 252-260. http://www.zentralblattmath.org/zmath/en/journals/search/

Papers in other refereed journals and proceedings

  1. Elfving T., Nikazad T., Popa C., A Class of Iterative Methods: Semi-Convergence, Stopping Rules, Inconsistency, and Constraining, in BIOMEDICAL MATHEMATICS: Promising Directions in Imaging, Therapy Planning, and Inverse Problems, Yair Censor, Ming Jiang, Ge Wang Editors, Medical Physics Publishing, Madison USA, 2010, pag. 157-184 (ISBN: 978-1-930524-48-4).
  2. Juncu Gh., Nicola A., Popa C., A numerical study of laminar flow past two circulating spheres in tandem, Proceedings of the XXXII-nd "Caius Iacob" National Conference on Fluid Mechanics and its Technical Applications, October 16 - 17, 2009, ``Elie Carafoli'' National Institute for Aerospace Research – INCAS Bucharest, Romania, pages 132-137 (ISSN 2067 – 4414).
  3. Petra S., Popa C., Schnorr C., Enhancing Sparsity by Constraining Strategies: Constrained SIRT versus Spectral Projected Gradient Methods, Proceedings of the 6th and 7th Workshops on Mathematical Modelling on Environmental and Life Sciences Problems, September 5-9, 2007 and October 22-25, 2008, Constanta, Romania; Editura Academiei Romane, Bucuresti 2010, 219-250.
  4. Duluman T., Popa C., New developments on constrained projection algorithms for image reconstruction, Proceedings of the 6th and 7th Workshops on Mathematical Modelling on Environmental and Life Sciences Problems, September 5-9, 2007 and October 22-25, 2008, Constanta, Romania; Editura Academiei Romane, Bucuresti 2010, 167-182.
  5. Juncu Gh., Nicola A., Popa C., Nonlinear iterative methods for water flow in variably satured porous media, Proceedings of the 6th and 7th Workshops on Mathematical Modelling on Environmental and Life Sciences Problems, September 5-9, 2007 and October 22-25, 2008, Constanta, Romania; Editura Academiei Romane, Bucuresti 2010, 183-190.
  6. Juncu Gh., Nicola A., Popa C., Udrescu T., Nonlinear Multigrid Methods for Groundwater Flow Problems in Heterogeneous porous media, Proceedings of the 6th and 7th Workshops on Mathematical Modelling on Environmental and Life Sciences Problems, September 5-9, 2007 and October 22-25, 2008, Constanta, Romania; Editura Academiei Romane, Bucuresti 2010, 45-56.
  7. Popa C., Zdunek R., On some constraining strategies in image reconstruction from projections, in Proceedings of the 5th Workshop on Mathematical Modelling on Environmental and Life Sciences Problems, September 10-13, 2006 Constanta, Romania; Editura Academiei Romane, Bucuresti 2008, 173-180.
  8. Koestler H., Popa C., Pruemmer M., Ruede U., Algebraic full multigrid in image reconstruction, in Proceedings of the 5th Workshop on Mathematical Modelling on Environmental and Life Sciences Problems, September 10-13, 2006 Constanta, Romania; Editura Academiei Romane, Bucuresti 2008, 123-130.
  9. Duluman T., Popa C., Algebraic reconstruction technique versus conjugate gradient in image reconstruction from projections, in Proceedings of the 5th Workshop on Mathematical Modelling on Environmental and Life Sciences Problems, September 10-13, 2006 Constanta, Romania; Editura Academiei Romane, Bucuresti 2008, 67-78.
  10. Bautu A., Bautu E., Popa C., A weighted Kaczmarz algorithm in image reconstruction, in Proceedings of the 5th Workshop on Mathematical Modelling on Environmental and Life Sciences Problems, September 10-13, 2006 Constanta, Romania; Editura Academiei Romane, Bucuresti 2008, 43-50.
  11. Koestler H., Popa C., Pruemmer M., Ruede U., Towards an algebraic multigrid method for tomographic image reconstruction - improving convergence of ART, paper 476 in Electronic Proceedings of European Conference on Computational Fluid Dynamics ECCOMAS CFD 2006, The Netherlands, 2006.
  12. Mohr M., Popa C., Ruede U., Analysis of a preconditioned CG method for an inverse bioelectric field problem, in Proceedings of the 4th Workshop on Mathematical Modelling on Environmental and Life Sciences Problems, September 7-10, 2005 Constanta, Romania; Editura Academiei Romane, Bucuresti 2006, 135--146.
  13. Popa C., Zdunek R., Gibbs regularized tomographic image reconstruction with DW algorithm based on generalized oblique projections, in Proceedings of the 4th Workshop on Mathematical Modelling on Environmental and Life Sciences Problems, September 7-10, 2005 Constanta, Romania; Editura Academiei Romane, Bucuresti 2006, 191--200.
  14. Popa C., Udrescu T., A fast approximation for discrete Laplacian, in Proceedings of the 4th Workshop on Mathematical Modelling on Environmental and Life Sciences Problems, September 7-10, 2005 Constanta, Romania; Editura Academiei Romane, Bucuresti 2006, 181--190.
  15. Bautu A., Bautu E., Popa C., Evolutionary algorithms in image reconstruction from limited data, in Proceedings of the 4th Workshop on Mathematical Modelling on Environmental and Life Sciences Problems, September 7-10, 2005 Constanta, Romania; Editura Academiei Romane, Bucuresti 2006, 15--26.
  16. Bautu A., Bautu E., Popa C., Tikhonov regularization in image reconstruction with Kaczmarz Extended algorithm, Proceedings of ASIM Conference, September 12-15 2005, Erlangen, Germany, SCS Publishing House e.V., 650-655.
  17. Popa C., Zdunek R., Regularized ART with Gibbs priors for tomographic image reconstruction, Proceedings of ASIM Conference, September 12-15 2005, Erlangen, Germany, SCS Publishing House e.V., 656-661.
  18. Popa C., Zdunek R., Penalized least-squares image reconstruction for borehole tomography, in Proceedings of Algoritmy 2005 Conference on Scientific Computing, Vysoke Tatry - Podbanske, March 13-18, 2005; Slovak Univ. of Tech., Bratislava, 260-269; cited in C13
  19. Nicolescu B., Popa C., Ruede U., An extended-matrix preconditioner for nonself-adjoint nonseparable elliptic equations, in Proceedings of Algoritmy 2005 Conference on Scientific Computing, Vysoke Tatry - Podbanske, March 13-18, 2005; Slovak Univ. of Tech., Bratislava, 230-239.
  20. Popa C., Zdunek R., New generalized oblique projections in DW algorithm with applications to borehole tomography, in Proceedings of The Third Workshop on Mathematical Modeling of Environmental and Life Sciences Problems, May 27-30, 2004, Constanta, Romania; Editura Academiei Romane, Bucuresti, 2004, 189-204.
  21. Mohr M., Popa C., Ruede U., A differential inverse problem for cardiac imaging, in Proceedings of The Third Workshop on Mathematical Modeling of Environmental and Life Sciences Problems, May 27-30, 2004, Constanta, Romania; Editura Academiei Romane, Bucuresti, 2004, 231-242.
  22. Petcu D., Popa C., On the parallel implementation of Kovarik's approximate orthogonalization algorithm, Proceedings of the 4th International Workshop SYNASC02, October 9-12, 2002 Timisoara, Romania; Editura Mirton Timisoara, 263-274.
  23. Popa C., On some extensions of Kaczmarz's projections method, In ''Applied and Computing Mathematics II'' - T. U. Kosice, Slovak Republik, 1998, 113-120.
  24. Golubovici G., Popa C., Interpolation and related coarsening techniques for the algebraic multigrid method, MULTIGRID METHODS IV in Intern. Series of Numer. Math., vol. 116, 201-213, Birkhauser-Verlag, Berlin, 1994; cited in C1, C7, C14, C17, C18, C28
  25. Popa C., The construction of the interpolation operator with ILU decomposition for algebraic positive definite systems, In Notes on Numerical Fluid Mech., vol. 41(1993), 122-129.
  26. Popa C., ILU decomposition for coarse grid correction step on algebraic multigrid, In ''Multigrid Methods : Special Topics and Appl. II'', GMD - Studien 189(1991), 263-272; cited in C2, C3

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    NOTE. Last update November 6, 2011.