アルファシェイプ
N. Akkiraju, H. Edelsbrunner, M. Facello, P. Fu, E. P. Mucke, and C. Varela. "Alpha shapes: definition and software". In Proc. Internat. Comput. Geom. Software Workshop 1995, Minneapolis.
Edelsbrunner, Herbert (1995), “Smooth surfaces for multi-scale shape representation”, Foundations of software technology and theoretical computer science (Bangalore, 1995), Lecture Notes in Comput. Sci., 1026, Berlin: Springer, pp. 391–412, MR1458090 .
Edelsbrunner, Herbert; Kirkpatrick, David G.; Seidel, Raimund (1983), “On the shape of a set of points in the plane”, IEEE Transactions on Information Theory 29 (4): 551–559, doi:10.1109/TIT.1983.1056714 .