1. Structure of Algebras;Albert,1961
2. Index of elliptic operators III;Atiyah;Ann. Math.,1968
3. On the structure of the unitary group;Dieudonne;Trans. Amer. Math. Soc.,1952
4. Forms over rings with involution;Fröhlich;J Algebra,1969
5. Topological Methods in Algebraic Geometry;Hirzebruch,1956