1. Jarlskog, C. (1974). ?Phenomenology of weak interactions,? § 6, Proceedings of the 1974 Cern School of Physics, CERN 74-72, Geneva.
2. Bernstein, J. (1968).Elementary Particles and their Currents, (Freeman and Company, San Francisco), Chaps. 9 and 10.
3. Delbourgo, R. and Salam, A. (1972).Phys. Lett.,40B, 381.
4. Salam, A. (1971). ?Nonpolynomial Lagrangians, renormalization and gravity,? inLectures from the Coral Gables Conferences on Fundamental Interactions, January 1971, (Gordon and Breach, New York), Vol. 1, p. 3.
5. Isham, C. (1971). ?Strong gravity,? inLectures from the Coral Gables Conferences on Fundamental Interactions (Gordon and Breach, New York), p. 95.