@Article{ delb, author = { De Lellis, Camillo }, title = { A note on Alberti's Rank--one Theorem }, journal = { Transport equations and multi-D hyperbolic conservation laws, 61-74, Lect. Notes Unione Mat. Ital., 5, Springer, Berlin.. }, year = { 2008 }, pages = { }, URL = { http://cvgmt.sns.it/paper/1156/ }, note = { cvgmt preprint} }