@article{Herman89,
  title = {On The Projective Invariant Representation of Conics in Computer Graphics},
  author = {Ivan Herman},
  year = {1989},
  url = {http://www.eg.org/EG/CGF/volume8/issue4/v08i4pp301-314_abstract.html},
  researchr = {https://researchr.org/publication/Herman89},
  cites = {0},
  citedby = {0},
  journal = {Comput. Graph. Forum},
  volume = {8},
  number = {4},
  pages = {301-314},
}