1. A. Einstein, Relativity: The Special and General Theory (Pi Press, New York, 2005).
2. L. D. Landau and E. M. Lifshitz, Course of Theoretical Physics, Vol. 2: The Classical Theory of Fields (Pergamon, Oxford, 1975).
3. C. Mtsller, The Theory of Relativity (Oxford Univ. Press, Oxford, 1972).
4. W. Rindler, Relativity: Special, General, and Cosmological (Oxford Univ. Press, Oxford, 2006).
5. J. R. Letaw and J. D. Pfautsch, Phys. Rev. D 22, 1345 (1980).