@Article{ 
  paouli09,
  author = { Paolini, Emanuele and Ulivi, Letizia },
  title = { The Steiner problem for infinitely many points },
  journal = { Rend. Sem. Mat. Univ. Padova },
  year = { 2010 },
  doi = { 10.4171/RSMUP/124-3 },
  volume = { 124 },
  pages = { 43-56 },
  URL = { http://cvgmt.sns.it/paper/1047/ },
  note = { cvgmt preprint}
}