TY - JOUR AU - M. M. Zainulabidov TI - The Bitsadze--Samarski{\v\i} problem for equations of mixed type JO - Differencialʹnye uravneniâ PY - 1986 SP - 54 EP - 59 VL - 22 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1986_22_1_a6/ LA - ru ID - DE_1986_22_1_a6 ER -