Three Dimensional Alpha Shapes. Edelsbrunner, H. & Mucke, E. ACM Trans.~Graph., 13:43--72, 1994.
bibtex   
@article{Edelsbrunner:1994aa,
	Author = {Edelsbrunner, H. and Mucke, E.},
	Date-Added = {2007-12-11 17:01:03 -0500},
	Date-Modified = {2012-04-07 21:51:58 -0400},
	Journal = {ACM Trans.~Graph.},
	Keywords = {molecular surface; convex hull; descriptor},
	Pages = {43--72},
	Title = {Three Dimensional Alpha Shapes},
	Volume = {13},
	Year = {1994}}

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