@article{DE_1976_12_10_a4,
     author = {V. I. Rozhkov and M. A. Hekimova},
     title = {A method for studying the periodic solutions of systems of difference and differential-difference equations with small lag},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1770--1780},
     publisher = {mathdoc},
     volume = {12},
     number = {10},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_10_a4/}
}