%0 Journal Article
%A I. I. Martynov
%T Systems with a piecewise constant matrix of coefficients
%J Differencialʹnye uravneniâ
%D 1977
%P 1135-1137
%V 13
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1977_13_6_a21/
%G ru
%F DE_1977_13_6_a21