@article{IVM_1963_1_a19,
     author = {N. V. Sharkova},
     title = {Approximate solution by the oscillating function method of integro-differential equations and differential equations with retarded argument},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {158--167},
     publisher = {mathdoc},
     number = {1},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1963_1_a19/}
}