@Misc{ 
  MorMon13,
  author = { Monika Ewa Stypa,  and Moreno, Giovanni },
  title = { On the vertex-to-edge duality between the Cayley graph and the coset
  geometry of von Dyck groups },
  journal = {  },
  year = { 2013 },
  pages = {  },
  URL = { https://gecogedi.dimai.unifi.it/paper/387/ },
  note = { cvgmt preprint}
}