@Misc{ 
  BelPaoPas17,
  author = { Bellettini, Giovanni and Paolini, Maurizio and Pasquarelli, Franco },
  title = { Triple covers and a non-simply connected surface spanning an elongated tetrahedron and beating the cone },
  journal = {  },
  year = { 2017 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3511/ },
  note = { cvgmt preprint}
}