@article{BSMF_1959__87__439_0,
     author = {Milnor, John W.},
     title = {Sommes de vari\'et\'es diff\'erentiables et structures diff\'erentiables des sph\`eres},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {439--444},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {87},
     year = {1959},
     doi = {10.24033/bsmf.1538},
     mrnumber = {22 #8518},
     zbl = {0096.17801},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.24033/bsmf.1538/}
}