@article{DE_1970_6_8_a10,
     author = {N. V. Sharkova},
     title = {Approximate solution of integro-differential equations with retarded argument by the method of oscillating functions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1418--1423},
     publisher = {mathdoc},
     volume = {6},
     number = {8},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_8_a10/}
}