Delta electroproduction in a chiral bag model approach
  We study the \gamma^* N -> \Delta transition amplitudes in a recoil corrected cloudy bag model approach. A modified Peierls-Thouless projection method is used to construct the Galilean invariant baryon states. The pionic contribution is found to be significant. The effect of the recoil correction is to reduce the magnitude of the transition amplitudes at small momentum transfer and to enhance them at modest momentum transfers. 
by D.H. Lu, A.W. Thomas and A.G. Williams