Computer algebra and computation of Puiseux expansions of algebraic functions. - Vladimir P. Gerdt; N. A. Kostov; Z. T. Kostova (EUROCAL, 1987)

Exact Solutions of Completely Integrable Systems and Linear ODE's Having Elliptic Function Coefficients. - N. A. Kostov; Z. T. Kostova (CASC, 2007)