@article{DE_1972_8_11_a5,
     author = {N. P. Kovalevskiǐ},
     title = {On the question of the existence of solutions of differential equations with deviating argument},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1957--1962},
     publisher = {mathdoc},
     volume = {8},
     number = {11},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_11_a5/}
}