@article{Juttler-Maurer-spatial-PH,
  volume = {31},
  number = {},
  mrnumber = {},
  issn = {},
  author = {J{\"u}ttler, Bert and M{\"a}urer, C},
  mrclass = {},
  fjournal = {Computer Aided Geometric Design},
  coden = {},
  title = {Cubic {P}ythagorean-hodograph spline curves and applications to sweep
           surface modeling},
  pages = {73--83},
  journal = {Comput. Aided Geom. Design},
  year = {1999},
}