1. J. D. Barrow and F. J. Tipler, The Anthropic Cosmological Principle (Clarendon, Oxford, 1986); M. J. Rees, Our Cosmic Habitat (Princeton University Press, Princeton, 2002); N. Bostrom, Anthropic Bias: Observation Selection Effects in Science and Philosophy (Routledge, New York, 2002); M. Tegmark, E-print archives, astroph/0302131; A. Aguirre and M. Tegmark, E-print archives, hep-th/0409072; G. L. Kane, M. J. Perry, and A. N. Zytkow, New Astron. 7, 45 (2002); P. Danies, Mod. Phys. Lett. A 19, 727 (2004); C. J. Hogan, in Universe or Multiverse?, Ed. by B. J. Carr (Cambridge University Press, Cambridge, 2005); E-print archives, astroph/0407086; W. R. Stoeger, G. F. R. Ellis, and U. Kirchner, astro-ph/0407329; A. Aguirre, in Universe or Multiverse?, Ed. by B. Carr (Cambridge University Press, Cambridge, 2005); E-print archives, astro-ph/0506519; M. Livio and M. J. Rees, Science (Washington) 309, 1022 (2005); S. Weinstein, Classical Quantum Gravity 23, 4231 (2006); E-print archives, hep-th/0508006; M. Tegmark, A. Aguirre, M. J. Rees, and F. Wilczek, Phys. Rev. D: Part. Fields 73, 023505 (2006).
2. W. Lerche, D. Lust, and A. N. Schellekens, Nucl. Phys. B 287, 477 (1987).
3. S. G. Rubin, Chaos, Solitons Fractals 14, 891 (2002); E-print archives, astro-ph/0207013; S. G. Rubin, Gravitation Cosmol. 9, 243 (2003); E-print archives, hep-ph/0309184.
4. S. Kachru, R. Kallosh, A. Linde and S. P. Trivedi, Phys. Rev. D: Part. Fields 68, 046005 (2003);
5. E-print archives, hep-th/0301240.