@ARTICLE{Kaelberer2005FreeLence,
  author = {K\"{a}lberer, Felix and Polthier, Konrad and Reitebuch, Ulrich and Wardetzky, Max},
  title = {FreeLence - Coding with Free Valences},
  journal = {Computer Graphics Forum},
  year = {2005},
  volume = {24},
  pages = {469--478},
  number = {3}
}