1. I. M. Gel'fand, A. M. Minlos andZ. Ya. Shapiro:Representations of the Rotation and Lorentz Groups and Their Applications (Oxford, 1963).
2. R. Courant andD. Hilbert:Methods of Mathematical Physics, Vol. II (New York, N. Y., 1974).
3. O. Laporte andG. E. Uhlenbeck:Phys. Rev.,37, 1380 (1931).
4. M. Fierz andW. Pauli:Proc. R. Soc. London, Ser. A,173, 211 (1939).
5. S. N. Gupta:Phys. Rev.,95, 1334 (1954).