@inproceedings{ijcai1985p180,
  title     = {Determining 3-D Motion of Planar Objects from Image Brightness Patterns},
  author    = {Negahdaripour, Shahriar and Horn, Berthold K. P.},
  booktitle = {Proceedings of the Ninth International Joint Conference on
               Artificial Intelligence, {IJCAI-85}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Aravind Joshi},
  pages     = {898--900},
  year      = {1985},
  note      = {Perception},
  url       = {https://ijcai.org/proceedings/1985/180},
}