@article{DE_1971_7_12_a5,
     author = {V. R. Nosov},
     title = {The existence of periodic solutions in linear systems of general form with a distributed deviation of the argument},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2168--2175},
     publisher = {mathdoc},
     volume = {7},
     number = {12},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_12_a5/}
}