@Article{ 
  fonleomue,
  author = { Fonseca, Irene and Leoni, Giovanni and Mueller, Stefan },
  title = { $A$-quasiconvexity: weak convergence and the gap },
  journal = { Ann. Inst. H. Poincaré Anal. Non Linéaire },
  year = { 2004 },
  volume = { 21 },
  number = { 2 },
  pages = { 209-236 },
  URL = { http://cvgmt.sns.it/paper/591/ },
  note = { cvgmt preprint}
}