1. About the early history of chiral symmetry see W. Pauli 1958 in: Collected Scientific Papers. ed. R. Kronig, V.F. Weisskopf, p. 1313 ff. Interscience Publish. New York: Wiley 1964; R.E Marshak, E.C.G. Sudarshan: talk at Racine, Wisconsin (1984)
2. W. Bacino: Phys. Rev. Lett.42, 749 (1979)
3. For early work see S. Adler, R. Dashen: Current Algebra. New York: Benjamin 1968
4. A. Ali, I.C. Yang: Phys. Lett.65B, 275 (1976)
5. D. Fakirov, B. Stech: Nucl. Phys.B133, 315 (1978)