References

ELEVEN LARGE-AMPLITUDE LIMIT CYCLES IN A POLYNOMIAL SYSTEM


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[8] Y. R. Liu and W. T. Huang, Seven large-amplitude limit cycles in a cubic polynomial system, International Journal of Bifurcation and Choas 16(2) (2006), 473-485.

[9] Y. R. Liu and J. B. Li, Theory of values of singular point in complex autonomial differential systems, Science in China (Series A) 33(1) (1990), 10-23.

[10] S. Shi, A concrete example of a quadratic system of the existence of four limit cycles for plane quadratic systems, Sci. Sinica A23 (1980),153-158.

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[12] Q. Zhang and Y. R. Liu, A cubic polynomial system with seven limit cycles at infinity, Applied Mathematics and Computation 177 (2006), 319-329.

[13] Q. Zhang and Y. R. Liu, A quintic polynomial differential system with eleven limit cycles at the infinity, Computers and Mathematics with Applications 53(10) (2007), 1518-1526.