Isochronism in the case of a focus
Differencialʹnye uravneniâ, Tome 5 (1969) no. 5, pp. 964-966.

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     author = {V. I. Chemodanov},
     title = {Isochronism in the case of a focus},
     journal = {Differencialʹnye uravneni\^a},
     pages = {964--966},
     publisher = {mathdoc},
     volume = {5},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_5_a20/}
}
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V. I. Chemodanov. Isochronism in the case of a focus. Differencialʹnye uravneniâ, Tome 5 (1969) no. 5, pp. 964-966. http://geodesic.mathdoc.fr/item/DE_1969_5_5_a20/