Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MAT_1960_4_5_a4, author = {H. Cartan}, title = {Suspension et invariant de {Hopf}}, journal = {Matematika}, pages = {49--72}, publisher = {mathdoc}, volume = {4}, number = {5}, year = {1960}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1960_4_5_a4/} }
H. Cartan. Suspension et invariant de Hopf. Matematika, Tome 4 (1960) no. 5, pp. 49-72. http://geodesic.mathdoc.fr/item/MAT_1960_4_5_a4/