@Article{ 
  celcupgui03,
  author = { Celada, Pietro and Cupini, Giovanni and Guidorzi, Marcello },
  title = { A sharp attainment result for nonconvex variational problems },
  journal = { Calc. Var. },
  year = { 2004 },
  volume = { 20 },
  pages = { 301-328 },
  URL = { http://cvgmt.sns.it/paper/969/ },
  note = { cvgmt preprint}
}