@inproceedings{sto-87-opg,
  author = {Jorge Stolfi},
  title = {Oriented Projective Geometry},
  booktitle = {Proceedings of the 3rd {ACM} Symposium on Computational Geometry (SOCG)},
  location = {Waterloo, Canada},
  pages = {76--85},
  year = 1987,
  month = jun,
  doi = {10.1145/41958.41966},
  isbn = {0-89791-231-4}
}