%0 Journal Article %A S. V. Maryushenkov %T The conditions of invertibility of a~class nonselfadjoint operators %J Izvestiya of Saratov University. Mathematics. Mechanics. Informatics %D 2012 %P 14-19 %V 12 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/ISU_2012_12_4_a2/ %G ru %F ISU_2012_12_4_a2