1. Beshers SN, Fewell JF (2001) Models of division of labor in social Insects. Annu Rev Entomol 46:413–440
2. Bourke AFG, Franks NR (1995) Social evolution in ants. Princeton University Press, Princeton, NJ
3. Calabi P (1988) Behavioral flexibility in Hymenoptera: a re-examination of the concept of caste. In: Trage JC (ed) Advances in Myrmecology. Brill Press, Leiden
4. Calabi P, Rosengraus R (1988) Interindividual differences based on behavior transition probabilities in the ant Camponotus sericeiventris. In: Jeanne RL (ed) Interindividual behavioral variability in social insects. Westview Press, Boulder, Colorado, pp 61–90
5. Calabi P, Traniello JFA (1989a) Behavioral flexibility in age castes of the ant Pheidole dentata. J Insect Behavior 2:663-677