%0 Journal Article %A Kh. A. Khachatryan %T Nontrivial solvability of a~class of nonlinear integro-differential equations of second order %J Matematičeskie trudy %D 2012 %P 172-193 %V 15 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MT_2012_15_2_a10/ %G ru %F MT_2012_15_2_a10