@article{DE_1989_25_4_a0,
     author = {N. E. Barabanov},
     title = {New frequency criteria for the absolute stability and instability of automatic control systems with nonstationary nonlinearity},
     journal = {Differencialʹnye uravneni\^a},
     pages = {555--563},
     publisher = {mathdoc},
     volume = {25},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_4_a0/}
}