%0 Journal Article %A N. V. Azbelev %T Some tendencies towards generalizations of a differential equation %J Differencialʹnye uravneniâ %D 1985 %P 1291-1304 %V 21 %N 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1985_21_8_a0/ %G ru %F DE_1985_21_8_a0