1. S. Mandelstam: talk presented at theWashington Meeting of the American Physical Society, April 1977;V. N. Gribov: SLAC-TRANS-176 (1977).
2. H. D. I. Abarbanel: private communication.
3. T. Eguchi: private communication;C. Bender, T. Eguchi andH. Pagels: Rockefeller University, preprint (1977).
4. A. Hanson: private communication;R. Jackiw: M.I.T. and Rockefeller University preprint CTP 697 (February 1978).
5. R. Jackiw, I. Muzinich andC. Rebbi: Brookhaven preprint (1977).