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On the Conditions of a Center and General Integrals of Quadratic Differential Systems |
wei yin ye department of mathematics. nanjing normal university. nanjing 210097, p. r. china yan qian ye department of mathematics. nanjing university, nanjing 210093, p. r. china
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《Acta Mathematica Sinica,English Series》
SCIE
CSCD
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2001 |
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