@article{Dietz-Hoschek-Juttler-quadrics-92,
  volume = {10},
  number = {3-4},
  mrnumber = {MR1235153 (95c:51031)},
  issn = {0167-8396},
  author = {Dietz, Roland and Hoschek, Josef and J{\"u}ttler, Bert},
  mrclass = {51N20 (65D17)},
  note = {Free-form curves and free-form surfaces (Oberwolfach, 1992)},
  fjournal = {Computer Aided Geometric Design},
  coden = {CAGDEX},
  title = {An algebraic approach to curves and surfaces on the sphere and on
           other quadrics},
  journal = {Comput. Aided Geom. Design},
  year = {1993},
  pages = {211--229},
}