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The official reference for this text, in BIBTeX format, is:

@inproceedings{akkiraju:alpha
,author=        "Akkiraju, N. and Edelsbrunner H. and Facello M.
                and Fu, P. and M{\"u}cke, E. P. and Varela, C."
,title=         "Alpha Shapes: Definition and Software."
,booktitle=     "Proceedings of the 1st International
                Computational Geometry Software Workshop"
,year=          1995
,pages=         "63--66"
,url=           "http://www.geom.uiuc.edu/software/cglist/GeomDir/shapes95def/"
}