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Reference16 articles.
1. W. B. Bonnor, Z. Phys.,161, 439, 1961.
2. Z. Perjés, Nuovo Cim.,55B, 600, 1968.
3. Z. Perjés, Commun. Math. Phys.,12, 273, 1975.
4. D. Robinson, Phys. Rev. Lett.,34, 905, 1975.
5. F. J. Ernst, Phys. Rev.,168, 1415, 1968.