@Article{ 
  celcupgui05,
  author = { Celada, Pietro and Cupini, Giovanni and Guidorzi, Marcello },
  title = { Existence and regularity of minimizers of nonconvex integrals with $p-q$ growth },
  journal = { ESAIM Control Optim. Calc. Var. },
  year = { 2007 },
  volume = { 13 },
  number = { 2 },
  pages = { 343-358 },
  URL = { http://cvgmt.sns.it/paper/1353/ },
  note = { cvgmt preprint}
}