@Article{ DeLSpaSpo15a, author = { De Lellis, Camillo and Spadaro, Emanuele and Spolaor, Luca }, title = { Regularity theory for $2$-dimensional almost minimal currents I: Lipschitz approximation }, journal = { Transactions AMS }, year = { 2018 }, volume = { 370 }, number = { 3 }, pages = { 1783–1801 }, URL = { http://cvgmt.sns.it/paper/2771/ }, note = { cvgmt preprint} }