@Article{ 
  celfer03,
  author = { Cellina, Arrigo and Ferriero, Alessandro },
  title = { Existence of Lipschitz solutions to the classical problem of the calculus of variations in the autonomous case },
  journal = { Ann. Inst. H. Poincaré Anal. Non Linéaire },
  year = { 2003 },
  volume = { 20 },
  number = { 6 },
  pages = { 374-384 },
  URL = { http://cvgmt.sns.it/paper/114/ },
  note = { cvgmt preprint}
}