@article{MT_2012_15_2_a10,
     author = {Kh. A. Khachatryan},
     title = {Nontrivial solvability of a~class of nonlinear integro-differential equations of second order},
     journal = {Matemati\v{c}eskie trudy},
     pages = {172--193},
     year = {2012},
     volume = {15},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_2012_15_2_a10/}
}