1. μ→eγ at a rate of one out of 109 muon decays?;Minkowski;Phys. Lett. B,1977
2. Horizontal gauge symmetry and masses of neutrinos;Yanagida;Conf. Proc. C,1979
3. Complex spinors and unified theories;Gell-Mann;Conf. Proc. C,1979
4. Neutrino mass and spontaneous parity nonconservation;Mohapatra;Phys. Rev. Lett.,1980
5. Neutrino masses in SU(2) x U(1) theories;Schechter;Phys. Rev. D,1980