@Misc{ 
  bra09,
  author = { Brasco, Lorenzo },
  title = { Curves of minimal action over metric spaces },
  journal = { Ann. Mat. Pura Appl. },
  year = { 2010 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1027/ },
  note = { cvgmt preprint}
}