http://www.cs.rice.edu/~rng/
http://compsci.rice.edu/
http://www.cs.rice.edu/~jwarren/graphics.html
http://subdivision.org/
http://www.cs.rice.edu/~jwarren/
http://planetmath.org/encyclopedia/GeneralizedBinomialCoefficients.html
http://www.combinatorics.org/
http://www.gnu.org/software/gsl/manual/gsl-ref.html#SEC294
http://en.wikipedia.org/wiki/Subdivision_surface
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