TY - JOUR AU - Yu. K. Sabitova TI - The first boundary problem with an integral condition for a mixed-type equation with a characteristic degeneration JO - Izvestiâ vysših učebnyh zavedenij. Matematika PY - 2020 SP - 46 EP - 64 IS - 11 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IVM_2020_11_a3/ LA - ru ID - IVM_2020_11_a3 ER -