Geodesic
Sufficiency conditions for isochronism of canonical systems of two differential equations
Differencialʹnye uravneniâ, Tome 1 (1965) no. 5, pp. 582-584.

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     author = {A. P. Vorob'ev},
     title = {Sufficiency conditions for isochronism of canonical systems of two differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {582--584},
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     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_5_a1/}
}
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A. P. Vorob'ev. Sufficiency conditions for isochronism of canonical systems of two differential equations. Differencialʹnye uravneniâ, Tome 1 (1965) no. 5, pp. 582-584. http://geodesic.mathdoc.fr/item/DE_1965_1_5_a1/