@article{DE_1973_9_3_a22,
     author = {Yu. F. Dolgii and S. N. Shimanov},
     title = {Stability of a certain system of differential equations with periodic lag},
     journal = {Differencialʹnye uravneni\^a},
     pages = {560--562},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_3_a22/}
}