1. J. P. Hsu,Found. Phys. 6, 317 (1976);8, 371 (1978);Nuovo Cimento B 74, 67 (1983);75, 185 (1983).
2. T. Chang,Found. Phys. 13, 1013 (1983).
3. C. Møller,The Theory of Relativity (Oxford University Press, Oxford, 1972), Section 8.5.
4. H. P. Robertson and T. W. Noonan,Relativity and Cosmology (Saunders, Philadelphia, 1968), Section 3.12.
5. T. Chang,Physics A 70, 1 (1979).