Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MAT_1957_1_1_a6, author = {H. Freudenthal}, title = {Oktaven, {Ausnahmegruppen} und {Oktavengeometrie}}, journal = {Matematika}, pages = {117--153}, publisher = {mathdoc}, volume = {1}, number = {1}, year = {1957}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1957_1_1_a6/} }
H. Freudenthal. Oktaven, Ausnahmegruppen und Oktavengeometrie. Matematika, Tome 1 (1957) no. 1, pp. 117-153. http://geodesic.mathdoc.fr/item/MAT_1957_1_1_a6/