Geodesic
Conditions for the isochronism of systems of two differential equations
Differencialʹnye uravneniâ, Tome 4 (1968) no. 11, pp. 1991-1993.

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     author = {I. I. Pleshkan},
     title = {Conditions for the isochronism of systems of two differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1991--1993},
     publisher = {mathdoc},
     volume = {4},
     number = {11},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_11_a6/}
}
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I. I. Pleshkan. Conditions for the isochronism of systems of two differential equations. Differencialʹnye uravneniâ, Tome 4 (1968) no. 11, pp. 1991-1993. http://geodesic.mathdoc.fr/item/DE_1968_4_11_a6/