Extension des applications - homotopie
Séminaire Henri Cartan, Espaces fibrés et homotopie, Tome 2 (1949-1950), Exposé no. 1, 6 p. 
@article{SHC_1949-1950__2__A1_0,
     author = {Serre, J-P.},
     title = {Extension des applications - homotopie},
     journal = {S\'eminaire Henri Cartan},
     note = {talk:1},
     pages = {1--6},
     year = {1949-1950},
     publisher = {Secr\'etariat math\'ematique},
     volume = {2},
     language = {fr},
     url = {https://www.numdam.org/item/SHC_1949-1950__2__A1_0/}
}
TY  - JOUR
AU  - Serre, J-P.
TI  - Extension des applications - homotopie
JO  - Séminaire Henri Cartan
N1  - talk:1
PY  - 1949-1950
SP  - 1
EP  - 6
VL  - 2
PB  - Secrétariat mathématique
UR  - https://www.numdam.org/item/SHC_1949-1950__2__A1_0/
LA  - fr
ID  - SHC_1949-1950__2__A1_0
ER  - 
%0 Journal Article
%A Serre, J-P.
%T Extension des applications - homotopie
%J Séminaire Henri Cartan
%Z talk:1
%D 1949-1950
%P 1-6
%V 2
%I Secrétariat mathématique
%U https://www.numdam.org/item/SHC_1949-1950__2__A1_0/
%G fr
%F SHC_1949-1950__2__A1_0
Serre, J-P. Extension des applications - homotopie. Séminaire Henri Cartan, Espaces fibrés et homotopie, Tome 2 (1949-1950), Exposé no. 1, 6 p.. https://www.numdam.org/item/SHC_1949-1950__2__A1_0/

Eilenberg : Extension and classification of continuous mappings. (Lectures in Topology - Michigan, 1941). | Zbl | MR

Hurewicz et Wallman : Dimension theory - Chapter VI (Princeton mathematical Series, n°4, 1941) | Zbl | JFM | MR