Opérations cohomologiques secondaires
Séminaire Henri Cartan, Volume 11 (1958-1959) no. 2, Talk no. 13, 20 p. 
@article{SHC_1958-1959__11_2_A4_0,
     author = {Cartan, Henri},
     title = {Op\'erations cohomologiques secondaires},
     journal = {S\'eminaire Henri Cartan},
     publisher = {Secr\'etariat math\'ematique},
     volume = {11},
     number = {2},
     year = {1958-1959},
     note = {talk:13},
     language = {fr},
     url = {http://www.numdam.org/item/SHC_1958-1959__11_2_A4_0}
}

Cartan, Henri. Opérations cohomologiques secondaires. Séminaire Henri Cartan, Volume 11 (1958-1959) no. 2, Talk no. 13, 20 p. http://www.numdam.org/item/SHC_1958-1959__11_2_A4_0/

[1] Adams (J.F.). - Non-existence of elements of Hopf-invariant one. - Princeton, 1958, multigraphié.