%0 Journal Article
%A Tung Chin-chu
%T Positions of limit-cycles of the system $\frac{dx}{dt}=\sum_{0\le{i+k}\le2}a_{ik}x^iy^k$, $\frac{dy}{dt}=\sum_{0\le{i+k}\le2}b_{ik}x^iy^k$
%J Matematika
%D 1962
%P 150-168
%V 6
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAT_1962_6_2_a4/
%G ru
%F MAT_1962_6_2_a4