The problem of the center ``in the large'' for a general quadratic
Doklady Akademii Nauk, Tome 311 (1990) no. 4, pp. 777-780.

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     author = {D. Bularas and N. I. Vulpe and K. S. Sibirskii},
     title = {The problem of the center ``in the large'' for a general quadratic},
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     year = {1990},
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D. Bularas; N. I. Vulpe; K. S. Sibirskii. The problem of the center ``in the large'' for a general quadratic. Doklady Akademii Nauk, Tome 311 (1990) no. 4, pp. 777-780. http://geodesic.mathdoc.fr/item/DAN_1990_311_4_a0/