@Article{ 
  mai10b,
  author = { Mainini, Edoardo },
  title = { A description of transport cost for signed measures },
  journal = { J. Math. Sci. (N.Y.) },
  year = { 2012 },
  volume = { 181 },
  number = { 6 },
  pages = { 837-855 },
  URL = { http://cvgmt.sns.it/paper/133/ },
  note = { cvgmt preprint}
}