Nucleon electromagnetic form factors and electroexcitation of low lying   nucleon resonances in a light-front relativistic quark model
  We utilize a light-front relativistic quark model (LF RQM) to predict the 3q core contribution to the electroexcitation amplitudes for the Delta(1232)P33, N(1440)P11, N(1520)D13, and N(1535)S11 up to Q2= 12GeV2. The parameters of the model have been specified via description of the nucleon electromagnetic form factors in the approach that combines 3q and pion-cloud contributions in the LF dynamics. 
I.G.Aznauryan and V.D.Burkert
hep-ph nucl-th