1. A review of the problems involved in radiative corrections to the semi-leptonic decays of baryons can be found inR. E. Marshak, Riazuddin andC. P. Ryan:Theory of Weak Interactions in Particle Physics (New York, N. Y., 1969). In this paper we use conventions used in this book. See alsoV. De Alfaro, S. Fubini, G. Furlan andC. Rossetti:Currents in Hadron Physics (London, 1973);Riazuddin: inWeak Interactions, Second International Summer School in Theoretical Physics, Karlsruhe, 1969, Tracts in Modern Physics, Vol.52 (Berlin, 1970);S. M. Berman andA. Sirlin:Ann. Phys.(N. Y.),20, 20 (1962);
2. A. Sirlin:Acta Phys. Austriaca Suppl.,5, 353 (1968).
3. G. Källén:Nucl. Phys.,18, 225 (1967).
4. S. Suzuki andY. Yakoo:Nucl. Phys. B,94, 431 (1975).
5. A. Sirlin:Phys. Rev.,164, 1767 (1967).