@Article{ fabfra04, author = { Colombo, Fabrizio and Tomarelli, Franco }, title = { Boundary value problems and obstacle problem for elastic bodies with free cracks }, journal = { ``Calculus of Variations: Topics from the Mathematical Heritage of Ennio De Giorgi'', D. Pallara ed., Quaderni di Matematica, 14, Dipartimento di Matematica Seconda Universita' di Napoli }, year = { 2004 }, volume = { 14 }, pages = { 221-243 }, URL = { http://cvgmt.sns.it/paper/584/ }, note = { cvgmt preprint} }