1. Vector Fields on Manifolds,;Atiyah;Arbeitsgemeinschaft fÜr Forschung des Landes Nordrhein-Westfalen, Heft,1970
2. An Introduction to Spinors and Geometry with Applications in Physics,;Benn,1987
3. Group Theory in Physics,;Cornwell,1997
4. Lie groups as spin groups,;Doran;J. Math. Phys.,1993
5. Randiconti di Mat.;Kähler;(Roma) ser.,1962