@article{DE_1990_26_10_a3,
     author = {Kh. G. Guseinov},
     title = {Strongly invariant sets and periodic solutions of a differential inclusion},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1690--1699},
     publisher = {mathdoc},
     volume = {26},
     number = {10},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_10_a3/}
}