%0 Journal Article %A Elduque, Alberto %T Order 3 Elements in G2 and Idempotents in Symmetric Composition Algebras %J Canadian journal of mathematics %D 2018 %P 1038-1075 %V 70 %N 5 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-2017-039-6/ %R 10.4153/CJM-2017-039-6 %F 10_4153_CJM_2017_039_6