1. Maynard-Smith, J. & Szathmá, E. The Major Transitions in Evolution (Oxford Univ. Press, 1995). | UIUC | |
2. Bickerton, D. Language and Species (Univ. Chicago Press, 1990). | UIUC | |
3. Ferrer i Cancho, R., Riordan, O. & Bollobá B. Proc. R. Soc. Lond. B doi:10.1098/rspb.2004.2957 (2005). | UIUC | |
4. Zipf, G. K. Human Behaviour and the Principle of Least Effort (Addison-Wesley, Cambridge, Massachusetts, 1949). | ||
5. Ferrer i Cancho, R. et al. Phys. Rev. E 69, 051915 (2003). | UIUC |