@Article{ belnov09, author = { Bellettini, Giovanni and Novaga, Matteo }, title = { Curvature Evolution of Nonconvex Lens-Shaped Domains }, journal = { J. Reine Angew. Math. }, year = { 2011 }, volume = { 656 }, pages = { 17-46 }, URL = { http://cvgmt.sns.it/paper/667/ }, note = { cvgmt preprint} }