1. Smolin, L.: The Life of the Cosmos (1997). From Oxford University Press (in the USA), Weidenfeld and Nicolson (in the United Kingdom) and Einaudi Editorici (in Italy)
2. Strominger, A.: Superstrings with torsion. Nucl. Phys. B 274, 253 (1986)
3. Kachru, S., Kallosh, R., Linde, A., Trivedi, S.P.: de Sitter vacua in string theory. Phys. Rev. D 68, 046005 (2003). arXiv:hep-th/0301240
4. Susskind, L.: The anthropic landscape of string theory. arXiv:hep-th/0302219
5. Susskind, L.: The Cosmic Landscape: String Theory and the Illusion of Intelligent Design. Little Brown, New York (2006)