@INPROCEEDINGS{Sara-OAGM92,
  Html =   { Sara-OAGM92 },
  AUTHOR =   {{\v S}{\'a}ra, Radim},
  ADDRESS =   {Wien, Austria},
  BOOKTITLE =   {Proceedings of 16th {\"O}{AGM} Workshop},
  EDITOR =   {Bischof, H. and Kropatch, W.},
  MONTH =   may,
  PAGES =   {129--138},
  TITLE =   {The Surface Structure of 3-{D} Curved Objects},
  YEAR =   {1992},
  KEYWORDS =   {computer vision, qualitative surface, surface model,
                  local shading analysis},
}