Geodesic
On series expansion of an Andronov–Hopf manifold of a quadratic system in the plane
Differencialʹnye uravneniâ, Tome 23 (1987) no. 2, pp. 278-282 
L. A. Cherkas; I. S. Shchukina. On series expansion of an Andronov–Hopf manifold of a quadratic system in the plane. Differencialʹnye uravneniâ, Tome 23 (1987) no. 2, pp. 278-282. http://geodesic.mathdoc.fr/item/DE_1987_23_2_a10/
@article{DE_1987_23_2_a10,
     author = {L. A. Cherkas and I. S. Shchukina},
     title = {On series expansion of an {Andronov{\textendash}Hopf} manifold of a quadratic system in the plane},
     journal = {Differencialʹnye uravneni\^a},
     pages = {278--282},
     year = {1987},
     volume = {23},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_2_a10/}
}
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