1. K. Gavroglu andM. D. Scadron:Nuovo Cimento A,14, 812 (1973).
2. For details seeR. E. Marshak, Riazuddin andC. P. Ryan:Theory of Weak Interactions in Particle Physics (New York, N. Y., 1968), and references therein.
3. M. D. Scadron andL. Thebaud:Phys. Rev. D,5, 2306 (1972).
4. J. M. Gaillard: private communication. An excellent article presenting the experimental situation concerning the hyperons is byJ. Lach andL. Pondrom: to appear inAnn. Rev. Nucl. Part. Sci.,29 (December 1979). Also Fermilab preprint 79/25 Exp. 2085.00.
5. Some of the more interesting and relatively recent articles which study these decays areI. Raszillier andI. O. Stamatescu:Rev. Roum. Phys.,16, 63 (1971);B. Brook:Prog. Theor. Phys.,51, 1123 (1974);I. Raszillier andL. Burlacu:Z. Phys.,233, 471 (1970);V. I. Zakharov, L. A. Kondratyuk andL. A. Ponomarev:Sov. J. Nucl. Phys.,8, 60 (1969).