1. Allen, P. M. (1985) "Towards a New Science of Complex Systems,"in The Science and Praxis of Complexity, Tokyo: United Nations University Press: 268-97.
2. Allen, P. M. (1988) "Evolution: Why the Whole is Greater than the Sum of its Parts,"in W. Wolff, C.J. Soeder, & F. R. Drepper (eds) Ecodynamics, Berlin: Springer Verlag: 2-30.
3. Allen, P. M. (1993) "Evolution: Persistent Ignorance from Continual Learning,"in R. H. Day & P. Chen (eds) Nonlinear Dynamics and Evolutionary Economics, Oxford, UK: Oxford University Press: 101-12.
4. Allen, P. M. (1994) "Evolutionary Complex Systems: Models of Technology Change,"in L. Leydesdorff & P. van den Besselaar (eds) Chaos and Economic Theory, London: Pinter.
5. Coherence, chaos and evolution in the social context