%0 Journal Article %A M. F. Sukhinin %T On three principles of solvability of operator equations %J Sbornik. Mathematics %D 1994 %P 35-46 %V 78 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1994_78_1_a2/ %G en %F SM_1994_78_1_a2