@article{CRMATH_2005__340_3_221_0,
     author = {Bourdaud, G\'erard},
     title = {Une propri\'et\'e de composition dans l'espace $ {H}^{s}$},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {221--224},
     publisher = {Elsevier},
     volume = {340},
     number = {3},
     year = {2005},
     doi = {10.1016/j.crma.2004.12.007},
     language = {fr},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2004.12.007/}
}