@article{BSMF_2005__133_4_619_0,
     author = {Bony, Jean-Michel},
     title = {Sommes de carr\'es de fonctions d\'erivables},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {619--639},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {133},
     number = {4},
     year = {2005},
     doi = {10.24033/bsmf.2499},
     mrnumber = {2233698},
     zbl = {1107.26008},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.24033/bsmf.2499/}
}