Geodesic
On the question of the analyticity of a manifold that defines limit cycles
Differencialʹnye uravneniâ, Tome 18 (1982) no. 5, pp. 839-845 
L. A. Cherkas. On the question of the analyticity of a manifold that defines limit cycles. Differencialʹnye uravneniâ, Tome 18 (1982) no. 5, pp. 839-845. http://geodesic.mathdoc.fr/item/DE_1982_18_5_a14/
@article{DE_1982_18_5_a14,
     author = {L. A. Cherkas},
     title = {On the question of the analyticity of a manifold that defines limit cycles},
     journal = {Differencialʹnye uravneni\^a},
     pages = {839--845},
     year = {1982},
     volume = {18},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1982_18_5_a14/}
}
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