@Article{ aceboufon, author = { Acerbi, Emilio and Bouchitté, Guy and Fonseca, Irene }, title = { Relaxation of convex functionals: the gap problem }, journal = { Ann. Inst. H. Poincaré Anal. Non Linéaire }, year = { 2003 }, volume = { 20 }, number = { 3 }, pages = { 359-390 }, URL = { http://cvgmt.sns.it/paper/1629/ }, note = { cvgmt preprint} }