@Misc{ beldacfus, author = { Bellettini, Giovanni and Dacorogna, Bernard and Fusco, Giorgio and Leonetti, Francesco }, title = { Qualitative properties of Lipschitz solutions of eikonal type systems }, journal = { Adv. Math. Sci. Appl. }, year = { 2005 }, pages = { }, URL = { http://cvgmt.sns.it/paper/1106/ }, note = { cvgmt preprint} }