Singularly perturbed differential equations with discontinuous coefficients and concentrated factors. - Ivanka Tr. Angelova; Lubin G. Vulkov (Appl. Math. Comput., 2004)

High-order difference schemes based on new Marchuk integral identities for one-dimensional interface problems. - Ivanka Tr. Angelova; Lubin G. Vulkov (J. Num. Math., 2005)

Uniform Convergence of Finite-Difference Schemes for Reaction-Diffusion Interface Problems. - Ivanka Tr. Angelova; Lubin G. Vulkov (LSSC, 2007)

High-order finite difference schemes for elliptic problems with intersecting interfaces. - Ivanka Tr. Angelova; Lubin G. Vulkov (Appl. Math. Comput., 2007)

A Two-Grid Method on Layer-Adapted Meshes for a Semilinear 2D Reaction-Diffusion Problem. - Ivanka Tr. Angelova; Lubin G. Vulkov (LSSC, 2009)

Two-grid algorithms for singularly perturbed reaction-diffusion problems on layer adapted meshes. - Ivanka Tr. Angelova; Lubin G. Vulkov (CoRR, 2016)