@article{DE_1979_15_12_a4,
     author = {G. S. Krechetov},
     title = {Preservation of the property of stability in the presence of two zero roots and a one-parameter family of periodic solutions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2151--2154},
     publisher = {mathdoc},
     volume = {15},
     number = {12},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1979_15_12_a4/}
}