Geodesic
The existence of a definitely positive first integral
Differencialʹnye uravneniâ, Tome 12 (1976) no. 6, pp. 1123-1124.

Voir la notice de l'article provenant de la source Math-Net.Ru

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     author = {V. S. Ermolin},
     title = {The existence of a definitely positive first integral},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1123--1124},
     publisher = {mathdoc},
     volume = {12},
     number = {6},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_6_a18/}
}
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V. S. Ermolin. The existence of a definitely positive first integral. Differencialʹnye uravneniâ, Tome 12 (1976) no. 6, pp. 1123-1124. http://geodesic.mathdoc.fr/item/DE_1976_12_6_a18/