@article{DE_2003_39_10_a2,
     author = {S. G. Krasovskii},
     title = {A {Criterion} for the {Invariance} of {Characteristic} {Exponents} of {Linear} {Systems} with a {Small} {Parameter} {Multiplying} the {Derivative}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1315--1324},
     publisher = {mathdoc},
     volume = {39},
     number = {10},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2003_39_10_a2/}
}