%0 Journal Article %A M. M. Shahin %T A boundary value problem in a class of discontinuous functions and the calculus of variations %J Differencialʹnye uravneniâ %D 1978 %P 1905-1906 %V 14 %N 10 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1978_14_10_a21/ %G ru %F DE_1978_14_10_a21