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"Constructive Hopf's Theorem: Or How to Untangle Closed Planar Curves."
Kurt Mehlhorn, Chee-Keng Yap (1988)
- Kurt Mehlhorn, Chee-Keng Yap:

Constructive Hopf's Theorem: Or How to Untangle Closed Planar Curves. ICALP 1988: 410-423

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