%0 Journal Article %A A. K. Boyarchuk %T “Co-stability” of conservative difference schemes for a differential equation and a system of differential equations of the fourth order with discontinuous coefficients %J Differencialʹnye uravneniâ %D 1965 %P 1652-1661 %V 1 %N 12 %U http://geodesic.mathdoc.fr/item/DE_1965_1_12_a12/ %G ru %F DE_1965_1_12_a12