Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MAT_1957_1_1_a1, author = {P. J. Hilton}, title = {On the homotopy groups of the union of spheres}, journal = {Matematika}, pages = {19--36}, publisher = {mathdoc}, volume = {1}, number = {1}, year = {1957}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1957_1_1_a1/} }
P. J. Hilton. On the homotopy groups of the union of spheres. Matematika, Tome 1 (1957) no. 1, pp. 19-36. http://geodesic.mathdoc.fr/item/MAT_1957_1_1_a1/