@article{DE_1973_9_2_a20,
     author = {N. E. Bol'shakov},
     title = {The role of {Perron's} non-regularity coefficient in the detection of stability of two-dimensional systems with respect to the first approximation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {363--365},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_2_a20/}
}