@article{Kaihuai-NURBS-quadrics-97,
  volume = {12},
  number = {3},
  mrnumber = {},
  issn = {},
  author = {Kaihuai, Qin},
  mrclass = {},
  fjournal = {Journal of Computer Science and Technology},
  coden = {},
  title = {Representing quadric surfaces using {NURBS} surfaces},
  pages = {210--216},
  journal = {J. of {C}omput. {S}ci. \& {T}echnol.},
  year = {1997},
}