%0 Journal Article %A M. M. Lavrent'ev (Jn.) %T A~priori smoothness of solutions for number of equations of a~changing type %J Matematičeskoe modelirovanie %D 1990 %P 145-153 %V 2 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/MM_1990_2_9_a12/ %G ru %F MM_1990_2_9_a12