Geodesic
Solution of a problem of the center “in the large” for a general quadratic differential system
Differencialʹnye uravneniâ, Tome 25 (1989) no. 11, pp. 1856-1862 
Bularas Driss; N. I. Vulpe; K. S. Sibirskii. Solution of a problem of the center “in the large” for a general quadratic differential system. Differencialʹnye uravneniâ, Tome 25 (1989) no. 11, pp. 1856-1862. http://geodesic.mathdoc.fr/item/DE_1989_25_11_a3/
@article{DE_1989_25_11_a3,
     author = {Bularas Driss and N. I. Vulpe and K. S. Sibirskii},
     title = {Solution of a problem of the center {\textquotedblleft}in the large{\textquotedblright} for a general quadratic differential system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1856--1862},
     year = {1989},
     volume = {25},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_11_a3/}
}
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