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Non-bifurcation of critical periods from semi-hyperbolic polycycles of quadratic centers. (arXiv:2105.10009v1 [math.DS]) http://arxiv.org/abs/2105.10009
Non-bifurcation of critical periods from semi-hyperbolic polycycles of quadratic centers. (arXiv:2105.10009v1 [math.DS]) http://arxiv.org/abs/2105.10009