@Misc{ 
  BonBreLem19,
  author = { Bonnivard, Matthieu and Bretin, Elie and Lemenant, Antoine },
  title = { Numerical approximation of the Steiner problem in dimension 2 and 3 },
  journal = { Mathematics of computation },
  year = { 2020 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4532/ },
  note = { cvgmt preprint}
}