Knot line refinement algorithms for tensor product B-spline surfaces

@article{Lyche1985KnotLR,
  title={Knot line refinement algorithms for tensor product B-spline surfaces},
  author={Tom Lyche and Elaine Cohen and Knut M\orken},
  journal={Computer Aided Geometric Design},
  year={1985},
  volume={2},
  pages={133-139}
}