@article{DE_1981_17_12_a0,
     author = {B. F. Bylov and \`E. A. Tikhonova},
     title = {On the stability of central and general indices of a piecewise-constant system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2115--2122},
     publisher = {mathdoc},
     volume = {17},
     number = {12},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_12_a0/}
}