Universal Texture of Quark and Lepton Mass Matrices and a Discrete   Symmetry Z_3
  Recent neutrino data have been favourable to a nearly bimaximal mixing, which suggests a simple form of the neutrino mass matrix. Stimulated by this matrix form, a possibility that all the mass matrices of quarks and leptons have the same form as in the neutrinos is investigated. The mass matrix form is constrained by a discrete symmetry Z_3 and a permutation symmetry S_2. The model, of course, leads to a nearly bimaximal mixing for the lepton sectors, while, for the quark sectors, it can lead to reasonable values of the CKM mixing matrix and masses. 
Yoshio Koide, Hiroyuki Nishiura, Koichi Matsuda, Tatsuru Kikuchi, and   Takeshi Fukuyama