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Submitted on: 24 September 2001.
Revised on: 27 October 2001.
Accepted on: 22 December 2001.
___________________DISCRETE & COMPUTATIONAL GEOMETRY
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Submitted on: 18 February 2022.
Revised on: 18 May 2022.
Accepted on: 29 May 2022.
___________________DISCRETE & COMPUTATIONAL GEOMETRY
http://reply.papertrans.cn/1/76/7535/7535-15.png
Submitted on: 05 September 2012.
Revised on: 28 September 2012.
Accepted on: 16 October 2012.
___________________DISCRETE & COMPUTATIONAL GEOMETRY
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http://reply.papertrans.cn/1/76/7535/7535-18.png
Submitted on: 27 September 2020.
Revised on: 15 January 2021.
Accepted on: 12 March 2021.
___________________DISCRETE & COMPUTATIONAL GEOMETRY
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