@article{DE_1978_14_12_a5,
     author = {G. S. Krechetov},
     title = {The stability of a perturbed system in a critical case},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2153--2157},
     publisher = {mathdoc},
     volume = {14},
     number = {12},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_12_a5/}
}