1. Gamma E, Helm R, Johnson R, Vlissides J. 1995. Design patterns: elements of reusable object-oriented software. Addison-Wesley J, Reading, MA 1995.
2. Anderson RW. 1988. Random-walk learning: a neurobiological correlate to trial-and-error. In Progress in neural networks, pp. 221–244. Ed. OM Omidvar, J Dayhoff. Academic Press, Boston.
3. Mueller S, Marchettod J, Airaghi S, Koumoutsakos P. 2002. Optimization based on bacterial chemotaxis. IEEE Trans Evolut Comput 6:16–29.
4. Simon HA. 1962. The architecture of complexity: Hierarchic systems. Proc Am Philos Soc 106:467–482 (reprinted as chap. 8 of [221]).
5. Simon HA. 1955. On a class of skew distribution functions. Biometrika 42:425–440.