Improved Perturbation Bounds for the Matrix Exponential. - Mihail Konstantinov; Petko Hr. Petkov; Parashkeva Gancheva; Vera Angelova; Ivan P. Popchev (WNAA, 1996)

Sensitivity analysis of the differential matrix Riccati equation based on the associated linear differential system. - Mihail Konstantinov; Vera Angelova (Adv. Comput. Math., 1997)

Perturbation Bounds for the Nonlinear Matrix Equation X + AHX-1A + BHX-1B = I. - Ivan P. Popchev; Petko Hr. Petkov; Mihail Konstantinov; Vera Angelova (LSSC, 2011)

Approximate solutions to large nonsymmetric differential Riccati problems with applications to transport theory. - Vera Angelova; Mustapha Hached; Khalide Jbilou (Numer. Linear Algebra Appl., 2020)