1. P. B. Price, E. K. Shirk, W. Z. Osborne andL. S. Pinsky: University of California, Berkeley, and University of Houston preprint. We have heard that 1) the magnetic charge appears to be more like 121e rather than 137e and 2) there are counter-arguments against the claims of this paper.
2. P. A. M. Dirac:Phys. Rev.,74, 817 (1948).
3. J. Schwinger:Science,165, 757 (1969). In a UCLA preprint (february 1975) Schwinger regards these magnetic charges as part of a magnetic colour group in the context of its relevance for J/Ψ particles.
4. A. O. Barut: inCoral Gables Conference on Fundamental Interactions at High Energy, Vol.2 (New York, N. Y., 1970), p. 199.
5. L. I. Schiff:Phys. Rev. Lett.,17, 714 (1966);Phys. Rev.,160, 1257 (1967).