%0 Journal Article %A Yu. L. Gaponenko %T Solvability of elementary two-point boundary value problems %J Differencialʹnye uravneniâ %D 1983 %P 1843-1847 %V 19 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1983_19_11_a0/ %G ru %F DE_1983_19_11_a0