TY - JOUR AU - M. B. Muratbekov AU - M. Otelbaev TI - Smoothness and approximation properties for solutions of a class of nonlinear equations of Schr\"odinger type JO - Izvestiâ vysših učebnyh zavedenij. Matematika PY - 1989 SP - 44 EP - 48 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IVM_1989_3_a7/ LA - ru ID - IVM_1989_3_a7 ER -