Verification of virtual Compton-scattering sum rules in quantum electrodynamics
Wu-yang Tsai, Lester L. DeRaad, Kimball A. Milton · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · 1975
Two new sum rules for virtual-photon forward Compton scattering derived by Schwinger are shown to be satisfied in the case of quantum electrodynamics by explicit calculation of the lowest-order contributions.