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Reference11 articles.
1. M. Lévy andJ. Sucher:Phys. Rev.,186, 1656 (1969).
2. See,e.g.,H. D. I. Abarbanel andC. Itzykson: inProceedings of the 1970 Cargèse Summer School, edited byP. Bessis, Vol.5 (New York, N. Y., 1972), p. 519.
3. G. Tiktopulos andS. B. Treiman:Phys. Rev. D,2, 805 (1970);R. Blankenbecler andR. L. Sugar:Phys. Rev. D,2, 3024 (1970).
4. M. Lévy andJ. Sucher:Phys. Rev. D,2, 1716 (1970).
5. C. A. Orzalesi andJ. Sucher: unpublished (1974).