Geodesic
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 
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/
@article{DE_1987_23_6_a6,
     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},
     pages = {981--993},
     year = {1987},
     volume = {23},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_6_a6/}
}
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