@article{DE_1966_2_12_a4,
     author = {\`E. I. Grudo},
     title = {Expansion of solutions of an integro-differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1587--1593},
     year = {1966},
     volume = {2},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1966_2_12_a4/}
}