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, Vol. 16 ›› Issue (1) : 107-113.
ON THE DECISION PROBLEM OF THE CENTRE OR FOCUS FOR THE SYSTEM x=φ(y)-F(x), y=-g(x)
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