TY - JOUR AU - N. Yu. Kapustin AU - K. B. Sabitov TI - On the solution of a problem in the theory of the Frankl problem for equations of mixed type JO - Doklady Akademii Nauk PY - 1991 SP - 1048 EP - 1052 VL - 317 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1991_317_5_a4/ LA - ru ID - DAN_1991_317_5_a4 ER -