TY - JOUR AU - O. M. Dzhokhadze TI - Some variants of the Frankl' problem for the Lavrent'ev--Bitsadze equation in a half-plane JO - Differencialʹnye uravneniâ PY - 1989 SP - 1614 EP - 1618 VL - 25 IS - 9 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1989_25_9_a21/ LA - ru ID - DE_1989_25_9_a21 ER -