@Article{ neg11, author = { Negri, Matteo }, title = { Crack propagation by a Regularization of the Principle of Local Symmetry }, journal = { Discrete Contin. Dyn. Syst. Ser. S }, year = { 2013 }, volume = { 6 }, pages = { 147-165 }, URL = { http://cvgmt.sns.it/paper/719/ }, note = { cvgmt preprint} }