@article{CRMATH_2016__354_7_677_0,
     author = {Ha{\"\i}m Br\'ezis and Petru Mironescu and Itai Shafrir},
     title = {Distances between classes of sphere-valued {Sobolev} maps},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {677--684},
     publisher = {Elsevier},
     volume = {354},
     number = {7},
     year = {2016},
     doi = {10.1016/j.crma.2016.05.001},
     language = {en},
}