@article{DE_1972_8_9_a16,
     author = {A. Kh. Gelig},
     title = {The stability of relay systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1684--1686},
     publisher = {mathdoc},
     volume = {8},
     number = {9},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_9_a16/}
}