A method for solving the problem of isochronism of the center
Differencialʹnye uravneniâ, Tome 16 (1980) no. 10, pp. 1893-1895.

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     author = {N. V. Pyzhkova and A. P. Sadovskii},
     title = {A method for solving the problem of isochronism of the center},
     journal = {Differencialʹnye uravneni\^a},
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     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_10_a21/}
}
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N. V. Pyzhkova; A. P. Sadovskii. A method for solving the problem of isochronism of the center. Differencialʹnye uravneniâ, Tome 16 (1980) no. 10, pp. 1893-1895. http://geodesic.mathdoc.fr/item/DE_1980_16_10_a21/