@Article{ delspa08, author = { De Lellis, Camillo and Emanuele Nunzio Spadaro, }, title = { Q-valued functions revisited }, journal = { Memoirs of the American Mathematical Society }, year = { 2011 }, volume = { 991 }, pages = { }, URL = { http://cvgmt.sns.it/paper/1539/ }, note = { cvgmt preprint} }