@article{DAN_1991_316_1_a3,
     author = {S. A. Vavilov},
     title = {On the solvability of a class of operator equations},
     journal = {Doklady Akademii Nauk},
     pages = {22--26},
     year = {1991},
     volume = {316},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_316_1_a3/}
}