@Article{ 
  PaoTam18,
  author = { Paolini, Emanuele and Tamagnini, Andrea },
  title = { Minimal cluster computation for four planar regions with the same area },
  journal = { Geometric Flows },
  year = { 2018 },
  doi = { 10.1515/geofl-2018-0007 },
  volume = { 3 },
  number = { 1 },
  pages = { 90--96 },
  URL = { http://cvgmt.sns.it/paper/3850/ },
  note = { cvgmt preprint}
}