@article{SHC_1949-1950__2__A2_0,
author = {Serre, J-P.},
title = {Groupes d'homotopie},
journal = {S\'eminaire Henri Cartan},
note = {talk:2},
pages = {1--7},
year = {1949-1950},
publisher = {Secr\'etariat math\'ematique},
volume = {2},
language = {fr},
url = {https://www.numdam.org/item/SHC_1949-1950__2__A2_0/}
}
Serre, J-P. Groupes d'homotopie. Séminaire Henri Cartan, Espaces fibrés et homotopie, Tome 2 (1949-1950), Exposé no. 2, 7 p.. https://www.numdam.org/item/SHC_1949-1950__2__A2_0/
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