TY - JOUR AU - G. D. Suvorov AU - G. A. Kuzik TI - Extended concept of the quasiconformality of a plane mapping and linear systems of differential equations of mixed type JO - Doklady Akademii Nauk PY - 1966 SP - 280 EP - 283 VL - 168 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1966_168_2_a7/ LA - ru ID - DAN_1966_168_2_a7 ER -