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2. B. E. Lautrup, A. Peterman, and E. de Rafael, Physics Reports No. 4 (1972). This is the most recent of a number of excellent reviews of the comparison between theory and the high precision experiments. Others are referenced in this work.
3. A. Kponou, V. W. Hughes, C. E. Johnson, S. A. Lewis, and F. M. J. Pichanick, Phys. Rev. Lett. 26, 1613 (1971).
4. C. Schwartz, Phys. Rev. 134, A1181 (1964).
5. J. Sucher, Ph.D. Thesis, Columbia, 1958 (unpublished).