@article{DE_2005_41_12_a3,
     author = {S. G. Kryzhevich},
     title = {A {Criterion} for {Conditional} {Instability} by the {First} {Approximation} for {Solutions} of {Differential} {Systems}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1605--1614},
     publisher = {mathdoc},
     volume = {41},
     number = {12},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2005_41_12_a3/}
}