@inproceedings{Toppan:20042d,
  author = "Toppan, Francesco",
  title = "{On a Division Algebra Classification of Constrained}",
  doi = "10.22323/1.013.0047",
  booktitle = "Proceedings of Fourth International Winter Conference on Mathematical Methods in Physics {\textemdash} PoS(WC2004)",
  year = 2004,
  volume = "013",
  pages = "047"
}