@Article{ belcasnov01, author = { Bellettini, Giovanni and Caselles, Vicent and Novaga, Matteo }, title = { The Total Variation Flow in $R^N$ }, journal = { J. Differential Equations }, year = { 2002 }, volume = { 184 }, number = { 2 }, pages = { 475-525 }, URL = { http://cvgmt.sns.it/paper/1083/ }, note = { cvgmt preprint} }