@article{ter-88-vis,
  author = {D. Terzopoulos},
  title = {The Computation of Visible-Surface Representations},
  journal = {IEEE Transactions on Pattern Analysis and Machine Intelligence},
  volume = {10},
  number = {4},
  pages = {417--438},
  year = 1988,
  comment = {Considers only the problem of fitting a surface given depth field or normals, possibly with discontinuities.}
}