@Article{ belnovpao99, author = { Bellettini, Giovanni and Novaga, Matteo and Paolini, Maurizio }, title = { Facet--breaking for three--dimensional crystals evolving by mean curvature }, journal = { Interfaces and Free Boundaries }, year = { 1999 }, volume = { 1 }, pages = { 39-55 }, URL = { http://cvgmt.sns.it/paper/221/ }, note = { cvgmt preprint} }