%0 Journal Article %A V. S. Rabinovich %T A priori estimates and the Fredholm property for a class of pseudo­differential operators %J Sbornik. Mathematics %D 1973 %P 191-206 %V 21 %N 2 %U http://geodesic.mathdoc.fr/item/SM_1973_21_2_a1/ %G en %F SM_1973_21_2_a1