On variants of the $ C + M_2(c) + M_3(C) $ NCG model of elementary   particles
  We investigate restrictions to be imposed over the non commutative geometry model C+M_2+M_3 to make it to fit with experimental data. By constraining the action over quarks, a leptophobic Z' is got 
A. Rivero (Dep Fisica Teorica, Univ Zaragoza)