@article{SHC_1954-1955__7_2_A10_0, author = {Serre, J. P.}, title = {Groupes d'homotopie des bouquets de sph\`eres}, journal = {S\'eminaire Henri Cartan}, note = {talk:20}, pages = {1--7}, publisher = {Secr\'etariat math\'ematique}, volume = {7}, number = {2}, year = {1954-1955}, language = {fr}, url = {http://archive.numdam.org/item/SHC_1954-1955__7_2_A10_0/} }
Serre, J. P. Groupes d'homotopie des bouquets de sphères. Séminaire Henri Cartan, Volume 7 (1954-1955) no. 2, Talk no. 20, 7 p. http://archive.numdam.org/item/SHC_1954-1955__7_2_A10_0/
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