@article{DE_1982_18_3_a23,
     author = {N. P. Oparin},
     title = {Approximation of linear stationary differential equations with deviating argument},
     journal = {Differencialʹnye uravneni\^a},
     pages = {545--547},
     publisher = {mathdoc},
     volume = {18},
     number = {3},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1982_18_3_a23/}
}