@Article{ HenPra15, author = { Hencl, Stanislav and Pratelli, Aldo }, title = { Diffeomorphic Approximation of $W^{1,1}$ Planar Sobolev Homeomorphisms }, journal = { J. Eur. Math. Soc. }, year = { 2018 }, pages = { }, URL = { http://cvgmt.sns.it/paper/2633/ }, note = { cvgmt preprint} }