Journal of Guangdong University of Technology ›› 1999, Vol. 16 ›› Issue (4): 83-86.
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[1] 葛渭高. 方程=h(y)-F(x),=-g(x)的极限环存在定理[J]. 应用数学学报. 1988(02) [2] 丁大正. Liénard方程极限环的存在性[J]. 应用数学学报. 1984(02) |
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