@article{DE_1973_9_11_a1,
     author = {M. A. Amatov},
     title = {Periodic solutions of a certain autonomous system of ordinary differential equations with discontinuous right-hand sides},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1937--1944},
     publisher = {mathdoc},
     volume = {9},
     number = {11},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_11_a1/}
}