@article{DE_1967_3_4_a11,
     author = {Yu. K. Lando},
     title = {Solvability of an integro-differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {695--697},
     publisher = {mathdoc},
     volume = {3},
     number = {4},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_4_a11/}
}