Geodesic
Letter to the editors: ``On the question of the isochrony of the center of two-dimensional analytic differential systems'' (Differencial'nye Uravnenija \textbf{13} (1977), no.~6, 971--980)
Differencialʹnye uravneniâ, Tome 13 (1977) no. 8.

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     author = {V. V. Amel'kin},
     title = {Letter to the editors: {``On} the question of the isochrony of the center of two-dimensional analytic differential systems'' {(Differencial'nye} {Uravnenija} \textbf{13} (1977), no.~6, 971--980)},
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V. V. Amel'kin. Letter to the editors: ``On the question of the isochrony of the center of two-dimensional analytic differential systems'' (Differencial'nye Uravnenija \textbf{13} (1977), no.~6, 971--980). Differencialʹnye uravneniâ, Tome 13 (1977) no. 8. http://geodesic.mathdoc.fr/item/DE_1977_13_8_a28/