@Article{ bradefvit, author = { Braides, Andrea and Defranceschi, Anneliese and Vitali, Enrico }, title = { Relaxation of elastic energies with free discontinuities and constraints on the strain }, journal = { Ann. Scuola Norm. Sup. Pisa (V) }, year = { 2002 }, volume = { 1 }, pages = { 275-317 }, URL = { http://cvgmt.sns.it/paper/183/ }, note = { cvgmt preprint} }