1. Geometric Algebra;Artin,1957
2. Noncommutative double Bruhat cells and their factorizations;Berenstein;Int. Math. Res. Not.,2005
3. A. Berenstein, V. Retakh, Noncommutative loops over Lie algebras, MPIM Preprint, 2006, No. 131
4. La géométrie des groupes classiques;Dieudonné,1971
5. On [A,A]/[A,[A,A]] and on a Wn-action on the consecutive commutators of free associative algebra;Feigin;Math. Res. Lett.,2007