@article{DE_1987_23_3_a19,
     author = {R. I. Alidema},
     title = {Frequency conditions for the entry into a sliding state of nonlinear systems with discontinuous characteristics},
     journal = {Differencialʹnye uravneni\^a},
     pages = {510--511},
     publisher = {mathdoc},
     volume = {23},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_3_a19/}
}