Seesaw neutrino masses from an $A_4$ model with two equal vacuum   expectation values
  We present a model for the lepton sector, with $A_4$ horizontal-symmetry group, in which two of the Higgs doublets in an $A_4$ triplet of Higgs doublets have equal vacuum expectation values. The model makes well-defined predictions for the effective light-neutrino Majorana mass matrix. We show that those predictions are compatible with the experimental data. 
P. M. Ferreira, L. Lavoura
hep-ph