Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MAT_1958_2_3_a1, author = {H. {\CYRT}{\cyro}da}, title = {Non-existence of mappings: $S^{31}\to S^{16}$ of the {Hopf} invariant~$1$}, journal = {Matematika}, pages = {21--24}, publisher = {mathdoc}, volume = {2}, number = {3}, year = {1958}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1958_2_3_a1/} }
H. Тоda. Non-existence of mappings: $S^{31}\to S^{16}$ of the Hopf invariant~$1$. Matematika, Tome 2 (1958) no. 3, pp. 21-24. http://geodesic.mathdoc.fr/item/MAT_1958_2_3_a1/