Ivanyuk N. N.
Ukr. Mat. Zh. - 1995. - 47, № 1. - pp. 30–38
For systems ofq linear differential equations ofnth order with polynomial matrix coefficients, a fundamental family of formal solutions defined in a certain sector of a complex plane is constructed by using the Laplace contour integral. For large positive values of an independent variable, the asymptotic representations of indicated solutions are obtained.
Construction of asymptotic representations of solutions from the classL?? for systems of differential equations by the method of characteristic matrix functions
Ukr. Mat. Zh. - 1994. - 46, № 9. - pp. 1148–1155
Ukr. Mat. Zh. - 1987. - 39, № 2. - pp. 224-229
Construction of normal-regular solutions of a system of linear differential equations with polynomial coefficients
Ukr. Mat. Zh. - 1986. - 38, № 3. - pp. 320–324