1. Y. Fujii:Ann. of Phys.,69, 494 (1972).
2. Y. Fron:Nature Phys. Sci.,234, 5 (1971).
3. C. Brans andR. H. Dicke:Phys. Rev.,124, 925 (1961).
4. The derivation is analogous to that of the Brans-Dicke equations given in ref. (7), p. 159.
5. S. Weinberg:Gravitation and Cosmology: Principles and Applications of the General Theory of Relativity (New York, 1972).