@Article{ DeLIna17, author = { De Lellis, Camillo and Inauen, Dominik }, title = { Fractional Sobolev regularity for the Brouwer degree }, journal = { Comm. Partial Differential Equations }, year = { 2017 }, volume = { 42 }, number = { 10 }, pages = { 1510–1523 }, URL = { http://cvgmt.sns.it/paper/3566/ }, note = { cvgmt preprint} }