From hierarchical radiative quark mass matrices and mixings to FCNC in   $SU(3)_c\times SU(2)_L\times U(1)_Y\times U(1)_H$
  We present the realization of a mechanism that generates all mases and mixing angles by using the top quark as seed in the context of an anomaly free abelian extension of the standard model. 
D. A. Restrepo