@Article{ 
  cupguimar09,
  author = { Cupini, Giovanni and Guidorzi, Marcello and Marcelli, Cristina },
  title = { Existence of minimizers of free autonomous variational problems via solvability of constrained ones. },
  journal = { Ann. Inst. H. Poincaré Anal. Non Linéaire },
  year = { 2009 },
  volume = { 26 },
  pages = { 1183-1205 },
  URL = { http://cvgmt.sns.it/paper/282/ },
  note = { cvgmt preprint}
}