@Article{ 
  bar,
  author = { Bardi, Martino },
  title = { On differential games with long-time-average cost },
  journal = { Ann. Internat. Soc. Dynam. Games },
  year = { 2009 },
  volume = { 10 },
  pages = { 3-18 },
  URL = { http://cvgmt.sns.it/paper/374/ },
  note = { cvgmt preprint}
}