Wow
Looks like T-Spline is also a company.
Some heavy reading to get some vague idea of what a T-Spline is, let alone a Nurb:
http://www.tsplines.com/technicalpapers.html
http://contentdm.lib.byu.edu/ETD/image/etd1813.pdf
http://contentdm.lib.byu.edu/ETD/image/etd804.pdf
http://contentdm.lib.byu.edu/ETD/image/etd2453.pdf
:)