@article{COCV_2016__22_4_1204_0,
     author = {Brezis, Ha{\"\i}m and Mironescu, Petru and Shafrir, Itai},
     title = {Distances between homotopy classes of {W\protect\textsuperscript{s,p}(\ensuremath{\mathbb{S}}\protect\textsuperscript{N};\ensuremath{\mathbb{S}}\protect\textsuperscript{N})}},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {1204--1235},
     publisher = {EDP-Sciences},
     volume = {22},
     number = {4},
     year = {2016},
     doi = {10.1051/cocv/2016037},
     zbl = {1371.46027},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/cocv/2016037/}
}