1. H. Weyl:The Classical Groups (Princeton, N. J., 1946).
2. See,e. g.,H. Boerner:Group Representations (Berlin, 1955);A. S. Wightman:Dispersion Relations and Elementary Particles, edited byC. de Witt andR. Omnès (New York, N. Y., 1960);H. Joos:Fortsch. Phys.,10, 65 (1962);
3. E. R. Pearl:Representations of the Lorentz Group and Projective Geometry (Amsterdam, 1969).
4. J. S. Briggs:Rev. Mod. Phys.,43, 189 (1971); and the book byE. El Baz andB. Castel:Graphical Methods of Spin Algebras (New York, N. Y., 1972).
5. H. P. Dürr andF. Wagner:Nuovo Cimento,53 A, 255 (1968).