%0 Journal Article %A S. I. Lyashko %T On~the~solubility of mixed boundary-value problems with operator-valued coefficients %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1987 %P 224-225 %V 42 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1987_42_3_a14/ %G en %F RM_1987_42_3_a14