1. Component groups of centralizer for nilpotent elements in semisimple algebraic groups;Alekseevskii;Trudy Tbiliss. Mat. Inst. Razmadze Acad. Nauk Gruzin. SSR,1979
2. Classification of four-vectors of the eight-dimensional space;Antonyan,1981
3. Groupes et Algèbres de Lie;Bourbaki,1968
4. Groupes et Algèbres de Lie;Bourbaki,1975
5. Proof of a conjecture of Kostant;Дoković;Trans. Amer. Math. Soc.,1987