TY - JOUR AU - G. D. Karatoprakliev TI - Nonlocal boundary value problems for equations of mixed type JO - Differencialʹnye uravneniâ PY - 1987 SP - 78 EP - 84 VL - 23 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1987_23_1_a8/ LA - ru ID - DE_1987_23_1_a8 ER -