Some relatively recent NURBS links.
They seem interesting, but may or may not be useful or understandable :-)

NURBS links:
https://www.oden.utexas.edu/media/reports/2020/2006.pdf

PalmerZipSupplementVolumetric Frame Fields:
https://dl.acm.org/doi/10.1145/3366786

https://dl.acm.org/doi/pdf/10.1145/3366786

http://www.geometry.caltech.edu/pubs/JFHB+15.pdf

https://www.researchgate.net/publication/318843707_A_flexible_approach_for_coupling_NURBS_patches_in_rotationless_isogeometric_analysis_of_Kirchhoff-Love_shells

https://core.ac.uk/download/pdf/48626818.pdf

https://www.graphics.rwth-aachen.de/media/papers/campen_sa2014_dsw_medium.pdf

- Brian