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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.
.