@Article{ 
  BaChMaSa13,
  author = { Baìa, Margarida and Chermisi, Milena and Matias, José and Santos, Pedro M. },
  title = { Lower semicontinuity and relaxation of signed  functionals with linear growth in the context of $\mathcal A$-quasiconvexity },
  journal = { Calculus of Variations and Partial Differential Equations },
  year = { 2013 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2234/ },
  note = { cvgmt preprint}
}