%0 Journal Article %A Yu. A. Dement'ev %T Representability of spatial boundary value problems in the form of a system of plane boundary value problems %J Differencialʹnye uravneniâ %D 1967 %P 348-350 %V 3 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1967_3_2_a16/ %G ru %F DE_1967_3_2_a16