%0 Journal Article %A A. Kh. Shamilov %T Solvability and unsolvability of a variant of boundary value problems with a free boundary for abstract second-order differential equations %J Differencialʹnye uravneniâ %D 1992 %P 281-289 %V 28 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1992_28_2_a12/ %G ru %F DE_1992_28_2_a12