%0 Journal Article %A M. B. Muratbekov %A M. Otelbaev %T Smoothness and approximation properties for solutions of a class of nonlinear equations of Schr\"odinger type %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1989 %P 44-48 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1989_3_a7/ %G ru %F IVM_1989_3_a7