1. C.H. Albright and M.-C. Chen, Lepton flavor violation in predictive SUSY-GUT models, Phys. Rev. D 77 (2008)113010 [ arXiv:0802.4228 ] [ SPIRES ].
2. J. Hisano, T. Moroi, K. Tobe and M. Yamaguchi, Lepton-flavor violation via right-handed neutrino Yukawa couplings in supersymmetric standard model, Phys. Rev. D 53 (1996) 2442 [ hep-ph/9510309 ] [ SPIRES ].
3. V. Cirigliano, A. Kurylov, M.J. Ramsey-Musolf and P. Vogel, Lepton flavor violation without supersymmetry, Phys. Rev. D 70 (2004) 075007 [ hep-ph/0404233 ] [ SPIRES ].
4. M.-C. Chen and H.-B. Yu, Minimal flavor violation in the lepton sector of the Randall-Sundrum model, Phys. Lett. B 672 (2009) 253 [ arXiv:0804.2503 ] [ SPIRES ].
5. J.C. Pati and A. Salam, Lepton number as the fourth color, Phys. Rev. D 10 (1974) 275 [ SPIRES ].