1. Barrow, J. D. and Matzner, R. A. (1977).Monthly Notices of the Royal Astronomical Society,180, 317.
2. Barrow, J. D., and Tipler, F. J. (1978).Nature,276, 453.
3. Barrow, J. D., and Tipler, F. J. (1985).Monthly Notices of the Royal Astronomical Society,216, 395.
4. Barrow, J. D., and Tipler, F. J. (1986).The Anthropic Cosmological Principle, Oxford University Press, Oxford.
5. Barrow, J. D., and Turner, M. S. (1970).Nature,292, 35.