@article{DE_1967_3_3_a7,
     author = {H. D. Hoang},
     title = {The theory of characteristic vectors and its application to the study of the asymptotic behavior of solutions of differential systems. {I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {446--467},
     publisher = {mathdoc},
     volume = {3},
     number = {3},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_3_a7/}
}