1. S. Adler, Lectures on elementary particles and quantum field theory, Eds. S. Deser et al. (MIT Press, Cambridge, MA, 1970). R. Jackiw, Lectures on current algebra and its applications, Eds. S. Treiman et al. (Princeton U.P., Princeton, N.J. 1972) and references therein.
2. K. Fujikawa, Phys. Rev. Lett. 42(1979)1195; Phys. Rev. Lett. 44.(1980) 1733; Phys. Rev. D21(1980)2848.
3. The path integral approach is reviewed in K. Fujikawa, Proc. Kyoto Summer Institute, May 1985; Ed. T. Inami (World Scientific, Singapore, 1986).
4. W.A. Bardeen & B. Zumino, Nucl. Phys. B244(1984)421 and refs. therein.
5. M.F. Atiyah & I.M. Singer, Ann. Math. 87(1968)484. M.F. Atiyah, R. Bott & V. Patodi, Invent. Math. 19(1973)279.