@inproceedings{daRocha:2004tb,
  author = "da Rocha, Roldao  and  Vaz, Jayme Jr.",
  title = "{Twistors, Generalizations and Exceptional Structures}",
  doi = "10.22323/1.013.0022",
  booktitle = "Proceedings of Fourth International Winter Conference on Mathematical Methods in Physics {\textemdash} PoS(WC2004)",
  year = 2004,
  volume = "013",
  pages = "022"
}