A Unitary Isobar Modell for Pion Photo- and Electroproduction on the Proton up to 1 GeV
D. Drechsel, O. Hanstein, S.S. Kamalov and L. Tiator Nucl. Phys. A645 (1999) 145-174 or nucl-th/9807001 or MKPH-T-98-10
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