方程(dy)/(dx)=(q_(00)+q_(10)x+q(10)y+q_(20)x~2+q_(11)xy+q_(02)y~2)/(p_(00)+p_(10)x+p(10)y+p_(20)x~2+p_(11)xy+p_(02)y~2)所定义的积分曲线的定性研究(Ⅲ):Ⅰ类方程的极限环的个数
Acta Mathematica Sinica, Chinese Series ›› 1964, Vol. 14 ›› Issue (1) : 119-127.
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