@Article{ gelfoc, author = { Focardi, Matteo and Gelli, Maria Stella }, title = { Relaxation of free-discontinuity energies with obstacle }, journal = { ESAIM COCV }, year = { 2008 }, volume = { 14 }, number = { 4 }, pages = { 879--896 }, URL = { http://cvgmt.sns.it/paper/900/ }, note = { cvgmt preprint} }