Strong isochronism of the center of dynamical systems with second-degree polynomials
Differencialʹnye uravneniâ, Tome 29 (1993) no. 5, pp. 739-743.

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     author = {V. V. Amel'kin and Ching Zan Dang},
     title = {Strong isochronism of the center of dynamical systems with second-degree polynomials},
     journal = {Differencialʹnye uravneni\^a},
     pages = {739--743},
     publisher = {mathdoc},
     volume = {29},
     number = {5},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1993_29_5_a0/}
}
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V. V. Amel'kin; Ching Zan Dang. Strong isochronism of the center of dynamical systems with second-degree polynomials. Differencialʹnye uravneniâ, Tome 29 (1993) no. 5, pp. 739-743. http://geodesic.mathdoc.fr/item/DE_1993_29_5_a0/