@article{AIHPC_2020__37_1_181_0,
     author = {De Philippis, G. and Pratelli, A.},
     title = {The closure of planar diffeomorphisms in {Sobolev} spaces},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {181--224},
     publisher = {Elsevier},
     volume = {37},
     number = {1},
     year = {2020},
     doi = {10.1016/j.anihpc.2019.08.001},
     mrnumber = {4049920},
     zbl = {1446.46018},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1016/j.anihpc.2019.08.001/}
}