@Misc{ MasNar11, author = { Masnou, Simon and Nardi, Giacomo }, title = { A coarea-type formula for the relaxation of a generalized elastica functional }, journal = { Journal of Convex Analysis }, year = { 2012 }, pages = { }, URL = { http://cvgmt.sns.it/paper/1718/ }, note = { cvgmt preprint} }