Geodesic
Centroaffine invariant center and simple saddle-center conditions for a quadratic differential system
Doklady Akademii Nauk, Tome 285 (1985) no. 4, pp. 819-823 Cet article a éte moissonné depuis la source Math-Net.Ru

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@article{DAN_1985_285_4_a10,
     author = {K. S. Sibirskii},
     title = {Centroaffine invariant center and simple saddle-center conditions for a quadratic differential system},
     journal = {Doklady Akademii Nauk},
     pages = {819--823},
     year = {1985},
     volume = {285},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_285_4_a10/}
}
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K. S. Sibirskii. Centroaffine invariant center and simple saddle-center conditions for a quadratic differential system. Doklady Akademii Nauk, Tome 285 (1985) no. 4, pp. 819-823. http://geodesic.mathdoc.fr/item/DAN_1985_285_4_a10/