Differencialʹnye uravneniâ, Tome 14 (1978) no. 9, pp. 1589-1593
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È. F. Kirnitskaya; K. S. Sibirskii. Conditions for two centers for a quadratic differential system. Differencialʹnye uravneniâ, Tome 14 (1978) no. 9, pp. 1589-1593. http://geodesic.mathdoc.fr/item/DE_1978_14_9_a5/
@article{DE_1978_14_9_a5,
author = {\`E. F. Kirnitskaya and K. S. Sibirskii},
title = {Conditions for two centers for a quadratic differential system},
journal = {Differencialʹnye uravneni\^a},
pages = {1589--1593},
year = {1978},
volume = {14},
number = {9},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/DE_1978_14_9_a5/}
}
TY - JOUR
AU - È. F. Kirnitskaya
AU - K. S. Sibirskii
TI - Conditions for two centers for a quadratic differential system
JO - Differencialʹnye uravneniâ
PY - 1978
SP - 1589
EP - 1593
VL - 14
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%P 1589-1593
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%U http://geodesic.mathdoc.fr/item/DE_1978_14_9_a5/
%G ru
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