Automatically R-Conserving SUSY SO(10) Models and Mixed Light Higgs   Doublets
  In automatic R-parity conserving SO(10) models, the simplest way to accomodate realistic fermion masses is to demand that that the light Higgs doublets be linear combinations of the {10} and {126}-bar grand unified Higgs representations. We study the realization of this mixed light Higgs property consistent with doublet-triplet splitting in a minimal model and discuss its predictions for neutrino masses and implications for proton decay. 
Dae-Gyu Lee and R. N. Mohapatra