On the isochronicity of systems of two differential equations whose right-hand sides contain common factors
Differencialʹnye uravneniâ, Tome 23 (1987) no. 6, pp. 981-993.

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     author = {I. I. Pleshkan},
     title = {On the isochronicity of systems of two differential equations whose right-hand sides contain common factors},
     journal = {Differencialʹnye uravneni\^a},
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     publisher = {mathdoc},
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     number = {6},
     year = {1987},
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     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_6_a6/}
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I. I. Pleshkan. On the isochronicity of systems of two differential equations whose right-hand sides contain common factors. Differencialʹnye uravneniâ, Tome 23 (1987) no. 6, pp. 981-993. http://geodesic.mathdoc.fr/item/DE_1987_23_6_a6/