%0 Journal Article %A S. E. Pastukhova %T The well-posedness of a mixed problem with an oblique derivative for the wave operator %J Differencialʹnye uravneniâ %D 1993 %P 1415-1424 %V 29 %N 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1993_29_8_a15/ %G ru %F DE_1993_29_8_a15