TY - JOUR AU - G. A. Ivashkina TI - On problems of Bicadze--Samarski{\v\i} type for the equation $U_{xx}+\operatorname{sgn}y|y|^mU_{yy}=0$ ($0 JO - Differencialʹnye uravneniâ PY - 1981 SP - 1078 EP - 1089 VL - 17 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1981_17_6_a12/ LA - ru ID - DE_1981_17_6_a12 ER -