1. Barrow, J. D. (1981).Quarterly Journal of the Royal Astronomical Society,22, 388?420.
2. Barrow, J. D. (1990). The mysterious lore of large numbers, inModern Cosmology in Retrospect, B. Bertotti, R. Balbinot, S. Bergia, and A. Messina, eds., Cambridge University Press, Cambridge, pp. 67?93.
3. Barrow, J. D., and Tipler, F. J. (1986).The Anthropic Cosmological Principle, Oxford University Press, Oxford, pp. 219?287.
4. Berman, M. S. (1992).International Journal of Theoretical Physics,31, 1217?1219.
5. Dirac, P. A. M. (1937).Nature,139, 323.