@article{BSMF_1932__60__1_0,
     author = {Birkhoff, George D.},
     title = {Sur quelques courbes ferm\'ees remarquables},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {1--26},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {60},
     year = {1932},
     doi = {10.24033/bsmf.1182},
     zbl = {0005.22002},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1182/}
}