@incollection{SB_1966-1968__10__145_0,
     author = {Gramain, Andr\'e},
     title = {\'El\'ements de $\pi _{2n-1}(S^n)$ d{\textquoteright}invariant de {Hopf} un},
     booktitle = {S\'eminaire Bourbaki : ann\'ees 1966/67 1967/68, expos\'es 313-346},
     series = {S\'eminaire Bourbaki},
     note = {talk:322},
     pages = {145--151},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {10},
     year = {1968},
     zbl = {0194.24402},
     language = {fr},
     url = {http://www.numdam.org/item/SB_1966-1968__10__145_0/}
}