Suspension et invariant de Hopf
Séminaire Henri Cartan, Volume 11 (1958-1959) no. 1, Talk no. 5, 19 p.
@article{SHC_1958-1959__11_1_A5_0,
     author = {Cartan, Henri},
     title = {Suspension et invariant de Hopf},
     journal = {S\'eminaire Henri Cartan},
     publisher = {Secr\'etariat math\'ematique},
     volume = {11},
     number = {1},
     year = {1958-1959},
     note = {talk:5},
     language = {fr},
     url = {http://www.numdam.org/item/SHC_1958-1959__11_1_A5_0}
}
Cartan, Henri. Suspension et invariant de Hopf. Séminaire Henri Cartan, Volume 11 (1958-1959) no. 1, Talk no. 5, 19 p. http://www.numdam.org/item/SHC_1958-1959__11_1_A5_0/

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