1. Alatalo, R. V., Eriksson, D., Gustafsson, L., and Lundberg, A., 1990, Hybridization between Pied and Collared Flycatchers: Sexual selection and speciation theory, J. Evol. Biol. 3:375–389.
2. Alexander, R. D., 1974, The evolution of social behavior, Ann. Rev. Ecol. Syst. 5:325–383.
3. Alexander, R. D., Hoogland, J. L., Howard, R., Noonan, K. M., and Sherman, P. W., 1979, Sexual dimorphism and breeding systems in pinnipeds, ungulates, primates and humans, in: Evolutionary Biology and Human Social Behaviour (N. A. Chagnon and W. D. Irons, eds.), Duxbury Press, North Scituate, Mass., pp. 402–435.
4. Andersson, M., 1982, Female choice selects for extreme tail length in a widowbird, Nature 299:818–820.
5. Andersson, M., 1983, On the function of conspicuous seasonal plumages in birds, Anim. Behav. 31:1262–1264.