Geodesic
Certain tests for the existence and absence of closed trajectories of a certain system of differential equations
Differencialʹnye uravneniâ, Tome 4 (1968) no. 4, pp. 639-645 Cet article a éte moissonné depuis la source Math-Net.Ru

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     author = {N. I. Avdonin},
     title = {Certain tests for the existence and absence of closed trajectories of a certain system of differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {639--645},
     year = {1968},
     volume = {4},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_4_a6/}
}
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N. I. Avdonin. Certain tests for the existence and absence of closed trajectories of a certain system of differential equations. Differencialʹnye uravneniâ, Tome 4 (1968) no. 4, pp. 639-645. http://geodesic.mathdoc.fr/item/DE_1968_4_4_a6/