TY - JOUR AU - G. D. Dachev TI - On some boundary value problems for a class of equations of mixed type JO - Doklady Akademii Nauk PY - 1980 SP - 1037 EP - 1040 VL - 250 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1980_250_5_a1/ LA - ru ID - DAN_1980_250_5_a1 ER -