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Pion photoproduction in the Δ(1232) region and chiral bag modelsRemoveG. Kälbermann and J. M. EisenbergPhys. Rev. D 28, 71 (1983)
Pion-pole term in electroproduction of off-mass-shell pionsRemoveRobert G. Ellis and Bruce H. J. McKellarPhys. Rev. D 28, 86 (1983)