1. J. Finjord, M.K. Gaillard: Phys. Rev.D22, 778 (1980) and references therein
2. P.K. Kabir: The CP puzzle: strange decays of the neutral kaons, New York: Academic Press 1968; L. Wolfenstein: Proceedings of the Workshop on Weak Interactions September 1975, Ohio, USA. CP violation in theK decays has been explained either as a second order effect of the ordinary weak interactions or as a first order effect of superweak interactions. The Ξ decays (and also the Ω− decays) offer an opportunity to test the limits of the ΔS=2 modes, thus testing, in a way, the possible consequences of these CP violating mechanisms outside theK-decays. S.F. Biagi et al.: Phys. Lett.,112B, 277, (1982); V.L. Fitch: Rev. Mod. Phys.53, 367, (1980); J.W. Cronin: ibid Rev. Mod. Phys.53, 373 (1980)
3. For an extensive review of these decays see R. Marshak, Marshak, C.P. Ryan: Theory of weak interactions in particle physics, New York: Wiley (1968). We use the same conventions as these authors. See also K. Gavroglu, M.D. Scadron: Nuovo Cimento14A, 812 (1973)
4. L.B. Okun: Weak interactions of elementary particles. (Israel Program of Scientific Translations 1965). See also Ref. 3 R. Theory of weak interactions in particle physics New York: Wiley (1968) Marshak et al.: p. 520
5. O.E. Overseth, S. Pakvasa: Phys. Rev.184, 1663 (1969); T. Reid, M. Trofimenkoff: Nucl. Phys.40B, 255, (1972)