Xiang-Yang Li, Shang-Hua Teng, and Alper Üngör Engineering Computations 15(3):280–291, 1999 Proc. 7th Int. Meshing Roundtable, Sandia Nat. Lab., Oct 1998, pp. 201–210 http://www.andrew.cmu.edu/user/sowen/abstracts/Li583.html
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