@article{DE_1980_16_5_a13,
     author = {S. M. Abramovich and G. A. Leonov},
     title = {A type of stability of phase systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {928--930},
     publisher = {mathdoc},
     volume = {16},
     number = {5},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_5_a13/}
}