Mass and mixing angle patterns in the Standard Model and its Minimal   Supersymmetric Extension
  Using renormalization group techniques, we examine several interesting relations among masses and mixing angles of quarks and leptons in the Standard Model. We extend the analysis to the minimal supersymmetric extension to determine its effect on these mass relations. Remarkably Supersymmetry allows for these relations to be satisfied at a single grand unified scale. 
H. Arason, D.J. Castano, E.J. Piard, and P. Ramond