1. Other reviews: J. Cronin, International School of Sub-nuclear Physics, Erice, July 1975.
2. Direct Lepton Reviews: L.M. Lederman, International Conference on High Energy Electron and Photon Interactions, Stanford, 1975. P. Piroue, Conference on Particles and Fields, BNL, October 1976; BNL 50598.
3. Y. Yamanouchi, Nuovo Cimento, 43, 193 (1966). L.B. Okun, Sov.J.Nucl.Phys. 3, 426 (1966).
4. Christenson, Hicks, Lederman, Limon and Zavattini, Phys.Rev.Lett. 25, 1523 (1970); Phys.Rev. D8, 2016 (1973).
5. L.M. Lederman, Physics Prospects (ISABELLE), BNL 17522 (1972), p. 396; 406. L.M. Lederman, Esoteric Particle Production at ISR, CERN (1972); L.M. Lederman, D. Saxon, Nucl.Phys. B63, 313 (1973).