Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{CMH_1967__42_139339, author = {B. Steer and J.M. Boardman}, title = {On {Hopf} {Invariants.}}, journal = {Commentarii mathematici Helvetici}, pages = {180--221}, publisher = {mathdoc}, volume = {42}, year = {1967}, zbl = {0166.19201}, url = {http://geodesic.mathdoc.fr/item/CMH_1967__42_139339/} }
B. Steer; J.M. Boardman. On Hopf Invariants.. Commentarii mathematici Helvetici, Tome 42 (1967), pp. 180-221. http://geodesic.mathdoc.fr/item/CMH_1967__42_139339/