Qualitative investigation in the large of integral curves of isochronous systems of two differential equations
Differencialʹnye uravneniâ, Tome 1 (1965) no. 4, pp. 439-441.

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     author = {A. P. Vorob'ev},
     title = {Qualitative investigation in the large of integral curves of isochronous systems of two differential equations},
     journal = {Differencialʹnye uravneni\^a},
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     year = {1965},
     language = {ru},
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}
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A. P. Vorob'ev. Qualitative investigation in the large of integral curves of isochronous systems of two differential equations. Differencialʹnye uravneniâ, Tome 1 (1965) no. 4, pp. 439-441. http://geodesic.mathdoc.fr/item/DE_1965_1_4_a1/