Good NURBS modeling theory resource?

 From:  seanphafer
5896.1 
Hi all.

I'm coming from years of using Cinema 4D, and purchased MOI a while back to do some CAD conversion, and to learn more about surface/nurbs modeling. Is there a good resource somewhere to help me wrap my head around the "principles" of NURBS modeling vs. POLY?

Any suggestions would be appreciated!

Thanks.

SPH