%0 Journal Article %A D. V. Sivakov %T On a problem of A. N. Tikhonov in a semibounded domain %J Differencialʹnye uravneniâ %D 1993 %P 905-907 %V 29 %N 5 %U http://geodesic.mathdoc.fr/item/DE_1993_29_5_a21/ %G ru %F DE_1993_29_5_a21