@article{SHC_1948-1949__1__A7_0,
     author = {Cartan, H.},
     title = {Op\'erateurs d'homotopie},
     journal = {S\'eminaire Henri Cartan},
     note = {talk:7},
     pages = {1--10},
     publisher = {Secr\'etariat math\'ematique},
     volume = {1},
     year = {1948-1949},
     language = {fr},
     url = {http://archive.numdam.org/item/SHC_1948-1949__1__A7_0/}
}