%0 Journal Article %A V. G. Skatetsky %T A certain theorem of B.\,P.~Demidovi{\v{c}} %J Differencialʹnye uravneniâ %D 1975 %P 835-840 %V 11 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1975_11_5_a6/ %G ru %F DE_1975_11_5_a6