%0 Journal Article %A V. B. Sokolovskii %T On a generalization of the Neumann problem %J Differencialʹnye uravneniâ %D 1988 %P 714-716 %V 24 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1988_24_4_a29/ %G ru %F DE_1988_24_4_a29