1. Langton CG (1989) Artificial Life. In: CG Langton (ed): Artificial Life. SFI Studies in the Sciences of Complexity, vol 6. Addison-Wesley Publishing Company, Redwood City CA
2. Deneubourg JL, Goss S (1989) Collective patterns and decision-making Ecol Ethol Evol 1: 295–311
3. Gordon DM (1989) Caste and change in social insects. In: P Harvey, L Partridge (eds): Oxford surveys in evolutionary biology. Oxford University Press, Oxford
4. Gordon DM (1996) The organization of work in social insect colonies. Nature 380: 121–124
5. Franks NR, Bryant S, Griffiths R, Hemerik L (1990) Synchronization of the behaviour within nests of the ant Leptothorax acervorum (Fabricius). I. Discovering the phenomenon and its relation to the level of starvation. Bull Math Biol 52: 597–612