1. I. Yu. Kobzarev and L. B. Okun, Zh. Éksp. Teor. Fiz. 43, 1904 (1962) [Sov. Phys. JETP 16, 1343 (1962)].
2. B. Mashhoon, arXiv:gr-qc/0311030.
3. T. C. Chapman and D. J. Leiter, Am. J. Phys. 44, 858 (1976).
4. L. D. Landau and E. M. Lifshitz, The Classical Theory of Fields (Pergamon, London, 1962).
5. F. W. Hehl and Wei-Tou Ni, Phys. Rev. D 42, 2045 (1990).