1. Mach, E. Die Mechanik in Ihrer Entwicklung Historisch–Kritisch Dargestellt (1883);
2. The Science of Mechanics 6th edn (Transl. McCormack, T. J.) (Open Court, LaSalle, Illinois 1960). 2. Gamow, G. Nature 158, 549 (1946). 3. Godel, K. Rev. mod. Phys. 21, 447–450 (1949). 4. Ozsvath, I. & Schiicking, E. L. Ann. Phys. 55, 166–204 (1969). 5. Collins, C. B. & Hawking, S. W. Mon. Not. R. astr. Soc. 162, 307–320 (1973). 6. Barrow, J. D., Juszkiewicz, R. & Sonoda, D. H. Mon. Not. R. astr. Soc. 213, 917–943 (1985). 7. Ellis, J. & Olive, K. A. Nature 303, 679–681 (1983). 8. Rothmann, T. & Ellis, G. F. R. Phys. Lett. B180, 19–24 (1986). 9. Vaidya, P. C. Pram. J. Phys. 25, 513–518 (1985). 10. Gron, 6. Phys. Rev D33, 1204–1205 (1986). 11. Jantzen, R. T. /. math. Phys. 27, 2748–2750 (1986). 12. Linde, A. D. Phys. Lett. 129B, 177–181 (1983). 13. Grishchuk, L. P. & Zeldovich, Ya. B. in Quantum Structure of Space and Time Proc. Nuffield Workshop Imperial College, London, 3–21 August 1981, 409–422 (eds Duff, M. J. & Isham, C. J.) (Cambridge Unviersity Press, 1982). 14. Tryon, E. P. Nature 246, 396–397 (1973). 15. Hartle, J. B. & Hawking, S. W. Phys. Rev. D28, 2960–2975 (1983). 16. Fang, L. Z. & Wu, Z. C. Int. J. mod. Phys. Al, 887–912 (1986). 17. Hawking, S. W. & Luttrell, J. C. Phys. Lett. 143B, 83–86 (1984). 18. Wright, W. A. & Moss, I. G. Phys. Lett. 154B, 115–119 (1985). 19. Amsterdamski, P. Phys. Rev. D31, 3073–3078 (1985). 20. Fang, L. Z. & Mo, H. J. Phys. Lett. B186, 297–302 (1987). 21. Panov, V. F. Soviet Phys. J. 28, 981–984 (1985). 22. Sanz, J. L. /. math. Phys. 23, 1732–1736 (1982). 23. Guth, A. H. Phys. Rev. D23, 347–356 (1981). 24. Halliwell, J. J. & Hawking, S. W. Phys. Rev. D31, 1777–1791 (1985). 25. Belinskii, V. A. & Khalatnikov, I. M. Soviet Phys. JETP 36, 591–597 (1973). 26. Ryan, M. P. & Shepley, L. C. Homogeneous Relativistic Cosmologies (Princeton University Press, 1975). 27. Aaronson, M., Huchra, J., Mould, J., Schechter, P. L. & Tully, R. B. Astrophys. J. 258, 64–76 (1982).