Current Algebra and Photoproduction of Pions, M. S. BHATIA AND P. NARAYANAswAMY LPhys.Rev. 172, 1742 (1968)).Consistent with the normal- ization used in the rest of the paper, the signs of the right-hand sides of Eqs.(12) and (13) should be reversed.All other equations are correct as they are.General Perturbation and Variational Methods for Responses to Time-Dependent Interactions in Quantum Mechanics, JEAN HEINRIcHs I Phys.
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Jean Heinrichs (1968) studied this question.