Geodesic
Letter to the editors: “On the question of the isochrony of the center of two-dimensional analytic differential systems” (Differencial'nye Uravnenija 13 (1977), no. 6, 971–980)
Differencialʹnye uravneniâ, Tome 13 (1977) no. 8 Cet article a éte moissonné depuis la source Math-Net.Ru

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     author = {V. V. Amel'kin},
     title = {Letter to the editors: {{\textquotedblleft}On} the question of the isochrony of the center of two-dimensional analytic differential systems{\textquotedblright} {(Differencial'nye} {Uravnenija} 13 (1977), no.~6, 971{\textendash}980)},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1537},
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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 13 (1977), no. 6, 971–980). Differencialʹnye uravneniâ, Tome 13 (1977) no. 8. http://geodesic.mathdoc.fr/item/DE_1977_13_8_a28/