@article{AIHPC_2006__23_4_539_0,
     author = {Van Schaftingen, Jean},
     title = {Anisotropic symmetrization},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {539--565},
     publisher = {Elsevier},
     volume = {23},
     number = {4},
     year = {2006},
     doi = {10.1016/j.anihpc.2005.06.001},
     mrnumber = {2245755},
     zbl = {05060816},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.anihpc.2005.06.001/}
}