%0 Journal Article %A O. M. Dzhokhadze %T Some variants of the Frankl' problem for the Lavrent'ev--Bitsadze equation in a half-plane %J Differencialʹnye uravneniâ %D 1989 %P 1614-1618 %V 25 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1989_25_9_a21/ %G ru %F DE_1989_25_9_a21