1. R. P. Feynman et al., The Feynman Lectures on Gravitation (Based on notes by. F. B. Morinigo and W. G. Wagner, edited by B. Hatfield), Addison-Wesley, Reading, Mass. (1995).
2. P. G. de Gennes, Superconductivity of Metals and Alloys, Benjamin, New York (1966).
3. J. Carstoiu, C. R. Acad. Sci. Paris, 268, 201–204 (1969).
4. M. A. Markov, “The Mach’s principle and physical vacuum in general relativity,” in: Problems of Theoretical Physics [in Russian] (Essays dedicated to Nikolai N. Bogoliubov on the occasion of his sixtieth birthday), Nauka, Moscow (1969), pp. 26–27.
5. E. F. Taylor and J. A. Wheeler, Spacetime Physics, Freeman, New York (1992).