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不连续平面分段线性系统的两点和四点极限环
李争康()
Two-Point and Four-Point Limit Cycles in Discontinuous Planar Piecewise Linear Systems
Li Zhengkang()

图7. 直线 $\mathcal{L}$ 与双曲线 $\mathcal{S}_{1}$ 相交的有效几何结构.

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