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Positions of limit-cycles of the system $\frac{dx}{dt}=\sum_{0\le{i+k}\le2}a_{ik}x^iy^k$, $\frac{dy}{dt}=\sum_{0\le{i+k}\le2}b_{ik}x^iy^k$
Tung Chin-chu
Citation:
Tung Chin-chu, “Positions of limit-cycles of the system $\frac{dx}{dt}=\sum_{0\le{i+k}\le2}a_{ik}x^iy^k$, $\frac{dy}{dt}=\sum_{0\le{i+k}\le2}b_{ik}x^iy^k$”, Matematika, 6:2 (1962), 150–168; Sci. Sinica, 8:2 (1959), 151–171
Linking options:
https://www.mathnet.ru/eng/mat215 https://www.mathnet.ru/eng/mat/v6/i2/p150
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