Geodesic
On the question of the isochronism of the center of two-dimensional analytic differential systems
Differencialʹnye uravneniâ, Tome 13 (1977) no. 6, pp. 971-980 Cet article a éte moissonné depuis la source Math-Net.Ru

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     author = {V. V. Amel'kin},
     title = {On the question of the isochronism of the center of two-dimensional analytic differential systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {971--980},
     year = {1977},
     volume = {13},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_6_a0/}
}
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V. V. Amel'kin. On the question of the isochronism of the center of two-dimensional analytic differential systems. Differencialʹnye uravneniâ, Tome 13 (1977) no. 6, pp. 971-980. http://geodesic.mathdoc.fr/item/DE_1977_13_6_a0/