Comparisons of Model Predictions of Pion Electrioproduction Amplitudes   in the low $Q^2$ Region
  Pion electroproduction amplitudes predicted by three theoretical models in the $Q^2 \leq 0.5$ (GeV/c)$^2$ region are compared. The objective is to facilitate the analyses of the data from new experiments on investigating the pion cloud effects on the $\gamma N \to \Delta$ transition form factors. 
T. Sato and T.-S. H. Lee