@article{daRocha:2004tb,
  author = "da Rocha, Roldao  and  Vaz, Jayme Jr.",
  title = "{Twistors, Generalizations and Exceptional Structures}",
  doi = "10.22323/1.013.0022",
  journal = "PoS",
  year = 2004,
  volume = "WC2004",
  pages = "022"
}