@article{10_4153_CJM_2017_039_6, author = {Elduque, Alberto}, title = {Order 3 {Elements} in {G2} and {Idempotents} in {Symmetric} {Composition} {Algebras}}, journal = {Canadian journal of mathematics}, pages = {1038--1075}, year = {2018}, volume = {70}, number = {5}, doi = {10.4153/CJM-2017-039-6}, url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2017-039-6/} }