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中国科学院数学与系统科学研究院期刊网
ISSN 0254-3079 CN 11-2040/O1
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中文
ON THE DECISION PROBLEM OF THE CENTRE OR FOCUS FOR THE SYSTEM x=φ(y)-F(x), y=-g(x)
Cai Sui-lin, Zhang Ping-guang
Acta Mathematicae Applicatae Sinica . 1993, (
1
): 107 -113 . DOI: 10.12387/C1993013