%0 Journal Article %A A. A. Samarskii %T Some problems of the theory of differential equations %J Differencialʹnye uravneniâ %D 1980 %P 1925-1935 %V 16 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1980_16_11_a1/ %G ru %F DE_1980_16_11_a1