1. μ→eγ at a rate of one out of 109 muon decays?
2. T. Yanagida, in: A. Sawada, A. Sugamoto (Eds.), Proceedings of the Workshop on Unified Theories and Baryon Number in the Universe, Tsukuba, 1979, KEK Report No. 79-18, Tsukuba
3. Quarks and Leptons;Glashow,1980
4. Proceeding of the Supergravity Stony Brook Workshop;Gell-Mann,1979
5. Neutrino Mass and Spontaneous Parity Nonconservation