@article{DE_1972_8_9_a1,
     author = {N. V. Azbelev and L. F. Rakhmatullina},
     title = {The {Cauchy} problem for differential equations with retarded argument},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1542--1552},
     publisher = {mathdoc},
     volume = {8},
     number = {9},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_9_a1/}
}