Raytcho D. Lazarov

Yalchin Efendiev, Juan Galvis, Raytcho D. Lazarov, Svetozar Margenov, Jun Ren: Robust Two-level Domain Decomposition Preconditioners for High-contrast Anisotropic Flows in Multiscale Media. Comput. Meth. in Appl. Math. 12(4): 415-436 (2012)

Panagiotis Chatzipantelidis, Raytcho D. Lazarov, Vidar Thomée: Some error estimates for the lumped mass finite element method for a parabolic problem. Math. Comput. 81(277) (2012)

Oleg P. Iliev, Raytcho D. Lazarov, Joerg Willems: Variational Multiscale Finite Element Method for Flows in Highly Porous Media. Multiscale Modeling & Simulation 9(4): 1350-1372 (2011)

Yalchin Efendiev, Juan Galvis, Raytcho D. Lazarov, Joerg Willems: Robust Solvers for Symmetric Positive Definite Operators and Weighted Poincaré Inequalities. LSSC 2011: 43-51

Rajen K. Sinha, Richard E. Ewing, Raytcho D. Lazarov: Mixed Finite Element Approximations of Parabolic Integro-Differential Equations with Nonsmooth Initial Data. SIAM J. Numerical Analysis 47(5): 3269-3292 (2009)

Richard E. Ewing, Oleg Iliev, Raytcho D. Lazarov, I. Rybak, Joerg Willems: A Simplified Method for Upscaling Composite Materials with High Contrast of the Conductivity. SIAM J. Scientific Computing 31(4): 2568-2586 (2009)

Oleg P. Iliev, Raytcho D. Lazarov, Joerg Willems: Discontinuous Galerkin Subgrid Finite Element Method for Heterogeneous Brinkman's Equations. LSSC 2009: 14-25

Raytcho D. Lazarov, Svetozar Margenov: CBS constants for multilevel splitting of graph-Laplacian and application to preconditioning of discontinuous Galerkin systems. J. Complexity 23(4-6): 498-515 (2007)

Craig C. Douglas, Yalchin Efendiev, Richard E. Ewing, Victor Ginting, Raytcho D. Lazarov: Dynamic Data Driven Simulations in Stochastic Environments. Computing 77(4): 321-333 (2006)

Rajen K. Sinha, Richard E. Ewing, Raytcho D. Lazarov: Some new error estimates of a semidiscrete finite volume element method for a parabolic integro-differential equation with nonsmooth initial data. SIAM J. Numerical Analysis 43(6): 2320-2343 (2006)

Craig C. Douglas, J. Clay Harris, Mohamed Iskandarani, Chris R. Johnson, Robert A. Lodder, Steven G. Parker, Martin J. Cole, Richard E. Ewing, Yalchin Efendiev, Raytcho D. Lazarov, Guan Qin: Dynamic Contaminant Identification in Water. International Conference on Computational Science (3) 2006: 393-400

Panagiotis Chatzipantelidis, Raytcho D. Lazarov: Error Estimates for a Finite Volume Element Method for Elliptic PDEs in Nonconvex Polygonal Domains. SIAM J. Numerical Analysis 42(5): 1932-1958 (2005)

Craig C. Douglas, Yalchin Efendiev, Richard E. Ewing, Victor Ginting, Raytcho D. Lazarov, Martin J. Cole, Greg Jones, Chris R. Johnson: Multiscale Interpolation, Backward in Time Error Analysis for Data-Driven Contaminant Simulation. International Conference on Computational Science (2) 2005: 640-647

Andrey B. Andreev, Raytcho D. Lazarov, Milena R. Racheva: Postprocessing and Improved Accuracy of the Lowest-Order Mixed Finite Element Approximation for Biharmonic Eigenvalues. LSSC 2005: 613-620

Craig C. Douglas, Chad E. Shannon, Yalchin Efendiev, Richard E. Ewing, Victor Ginting, Raytcho D. Lazarov, Martin J. Cole, Greg Jones, Chris R. Johnson, Jennifer Simpson: A Note on Data-Driven Contaminant Simulation. International Conference on Computational Science 2004: 701-708

Craig C. Douglas, Yalchin Efendiev, Richard E. Ewing, Raytcho D. Lazarov, Martin J. Cole, Greg Jones, Chris R. Johnson: Virtual Telemetry for Dynamic Data-Driven Application Simulations. International Conference on Computational Science 2003: 279-288

Raytcho D. Lazarov, Svetozar Margenov: On a Two-Level Parallel MIC(0) Preconditioning of Crouzeix-Raviart Non-conforming FEM Systems. Numerical Methods and Application 2002: 192-204

Richard E. Ewing, Raytcho D. Lazarov, Yanping Lin: Finite Volume Element Approximations of Nonlocal in Time One-Dimensional Flows in Porous Media. Computing 64(2): 157-182 (2000)

Raytcho D. Lazarov, Joseph E. Pasciak, Panayot Vassilevski: Mixed Finite Element Methods for Elliptic Problems on Non-Matching Grids. LSSC 1999: 25-35

James H. Bramble, Raytcho D. Lazarov, Joseph E. Pasciak: A least-squares approach based on a discrete minus one inner product for first order systems. Math. Comput. 66(219): 935-955 (1997)

Zhangxin Chen, Richard E. Ewing, Raytcho D. Lazarov: Domain decomposition algorithms for mixed methods for second-order elliptic problems. Math. Comput. 65(214): 467-490 (1996)

Raytcho D. Lazarov, Panayot Vassilevski, Svetozar Margenov: Solving Elliptic Problems by the Domain Decomposition Method Using Proconditioning Matrices Derived by Multilevel Splitting of the Finite Element Matrix. ICS 1987: 826-835