1. S.M. Barr and A. Zee, Calculating the electron mass in terms of measured quantities, Phys. Rev. D 17 (1978) 1854 [
INSPIRE
].
2. F. Wilczek and A. Zee, Horizontal interaction and weak mixing angles, Phys. Rev. Lett. 42 (1979) 421 [
INSPIRE
].
3. A. Davidson, M. Koca and K.C. Wali, U(1) as the minimal horizontal gauge symmetry, Phys. Rev. Lett. 43 (1979) 92 [
INSPIRE
].
4. C.L. Ong, Adding a horizontal gauge symmetry to the Weinberg-Salam model: an eight quark model, Phys. Rev. D 19 (1979) 2738 [
INSPIRE
].
5. T. Yanagida, Horizontal symmetry and mass of the top quark, Phys. Rev. D 20 (1979) 2986 [
INSPIRE
].