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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@article{DAN_1990_311_4_a0,
author = {D. Bularas and N. I. Vulpe and K. S. Sibirskii},
title = {The problem of the center {\textquotedblleft}in the large{\textquotedblright} for a general quadratic},
journal = {Doklady Akademii Nauk},
pages = {777--780},
year = {1990},
volume = {311},
number = {4},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/DAN_1990_311_4_a0/}
}
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/