Geodesic
On the existence of a family of periodic solutions for a system of differential equations in case of zero roots
Differencialʹnye uravneniâ, Tome 1 (1965) no. 1, pp. 17-24 
V. A. Pliss. On the existence of a family of periodic solutions for a system of differential equations in case of zero roots. Differencialʹnye uravneniâ, Tome 1 (1965) no. 1, pp. 17-24. http://geodesic.mathdoc.fr/item/DE_1965_1_1_a2/
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     author = {V. A. Pliss},
     title = {On the existence of a family of periodic solutions for a system of differential equations in case of zero roots},
     journal = {Differencialʹnye uravneni\^a},
     pages = {17--24},
     year = {1965},
     volume = {1},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_1_a2/}
}
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