1. Barbour, J. (1999). The end of time. London: Weidenfeld and Nicolson.
2. Barbour, J. (2012). Shape dynamics. In F. Finster et al. (Eds.), An introduction in quantum field theory and gravity. Basel: Birkhäuser.
3. Brown, H. R., & Timpson, C. G. (2006). In W. Demopoulos & I. Pitowsky (Eds.), Physical theory and its interpretation: Essays in honor of Jeffrey Bub (pp. 29–41). Dordrecht: Springer.
4. de Grey, A. (2007). In M. Rae (Ed.), Ending aging. New York: St. Martin’s Press.
5. Deutsch, D. (1985). Quantum theory, the Church-Turing principle and the universal quantum computer. Proceedings of the Royal Society A, 400, 97–117.