ON THE UNIQUENESS OF THE LIMIT CYCLE OF THE QUADRATIC SYSTEM WITH A WEAK FOCUS OF ORDER 2
CHEN WEN-CHENG;ZHANG PIN-GUANG
Journal of Systems Science and Mathematical Sciences ›› 1991, Vol. 11 ›› Issue (3) : 217-226.
ON THE UNIQUENESS OF THE LIMIT CYCLE OF THE QUADRATIC SYSTEM WITH A WEAK FOCUS OF ORDER 2
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