I've been googling for papers on the deformation of NURBS, and universal deformation tech.
A lot of papers these days are "pay per view", and a lot of the math is "incomprehensible," and only useable by CAD programmers.

The following link is relatively recent. It seems to be a "summary":
http://diogenes.bg/ijam/contents/2018-31-6/12/12.pdf

I also located a Thesis that did a lot of explaining, but do not know what use it could be.

- Brian
Grammarly is now correcting my grammar mistakes. I did not load it AFAIK.