@article{DE_1965_1_1_a5,
     author = {Yu. S. Bogdanov},
     title = {Asymptotic characteristics of nonlinear differential systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {41--52},
     publisher = {mathdoc},
     volume = {1},
     number = {1},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_1_a5/}
}