@article{BSMF_1958__86__271_0,
     author = {Eckmann, Beno},
     title = {Groupes d'homotopie et dualit\'e},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {271--281},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {86},
     year = {1958},
     doi = {10.24033/bsmf.1506},
     mrnumber = {21 #5189},
     zbl = {0092.40202},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1506/}
}