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Reference14 articles.
1. SeeS. L. Adler andR. F. Dashen:Current Algebras (New York, 1968);B. Renner:Current Algebras and Their Applications (Oxford, 1968), and references quoted therein.
2. S. L. Adler:Phys. Rev.,140, B 736 (1965);W. I. Weisberger:Phys. Rev.,143, 1302 (1966).
3. C. G. Callan andS. B. Treiman:Phys. Rev. Lett.,16, 153 (1966).
4. T. Das, G. S. Guralnik, V. S. Mathur, F. E. Low andJ. E. Young:Phys. Rev. Lett.,18, 759 (1967).
5. An excellent review paper with an extensive bibliography on the subject isS. Gasiorowicz andD. A. Geffen:Rev. Mod. Phys.,41, 531 (1969).