@article{PM_2008_2008_1_a2,
     author = {Elduque, A. and   Okubo, S.},
     title = {S4-symmetry on the {Tits} construction of exceptional {Lie} algebras and superalgebras },
     journal = {Publicacions matem\`atiques},
     pages = {315-346},
     year = {2008},
     volume = {52},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_2008_2008_1_a2/}
}