@article{DE_1999_35_10_a4,
     author = {Yu. F. Dolgii and S. G. Nikolaev},
     title = {On the stability of a periodic system of differential equations with delay},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1330--1336},
     publisher = {mathdoc},
     volume = {35},
     number = {10},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_10_a4/}
}