@Article{ 
  Lew17,
  author = { Lewintan, Peter },
  title = { Geometric Calculus of the Gauss Map },
  journal = { Adv. Appl. Clifford Algebras },
  year = { 2017 },
  doi = { https://doi.org/10.1007/s00006-016-0727-1 },
  volume = { 27 },
  number = { 1 },
  pages = { 503–521 },
  URL = { http://cvgmt.sns.it/paper/4449/ },
  note = { cvgmt preprint}
}