1. Groupes et Algèbres de Lie;Bourbaki,1968
2. Point-line geometries associated with buildings;Cohen,1995
3. A.M. Cohen, G. Ivanyos, Root filtration spaces, European J. Combin. (2005), submitted for publication
4. Lie algebras generated by extremal elements;Cohen;J. Algebra,2001
5. Abstract Root Subgroups and Simple Groups of Lie-Type;Timmesfeld,2001