Clarke, B. (1972). Density-dependent selection. American Naturalist 106, 1–13.
Clarke, B. (1979). The evolution of genetic diversity. Proceedings of the Royal Society B 206, 453–474.
Clarke, B. & Allendorf, F. W. (1979). Frequency-dependent selection due to kinetic differences between allozymes. Nature 279, 732–734.
Crow, J. F. & Temust, R. G. (1964). Evidence for the partial dominance of recessive lethal genes in natural populations of Drosophila. American Naturalist 98, 21–33.
de Jong, G. (1976). A model of competition for food. I. Frequency-dependent viabilities. American Naturalist 110, 1013–1027.
Dempster, E. R. (1955). Maintenance of genetic heterogeneity. Cold Spring Harbor Symposia on Quantitative Biology 20, 25–32.
Gillespie, J. H. (1976). A general model to account for enzyme variation in natural populations. II. Characterization of the fitness functions. American Naturalist 110, 809–821.
Gillespie, J. H. (1977). A general model to account for enzyme variation in natural populations. IV. The quantitative genetics of viability mutants. In Measuring Selection in Natural Populations (ed. Christiansen, F. B. and Fenchel, T. M.), pp. 301–314. Berlin: Springer-Verlag.
Hoekstra, R. F. (1978). Sufficient conditions for polymorphism with cyclical selection in a subdivided population. Genetical Research 31, 67–73.
Levene, H. (1953). Genetic equilibrium when more than one ecological niche is available. American Naturalist 87, 331–333.
Levins, R. (1962). Theory of fitness in a heterogeneous environment. I. The fitness set and adaptive function. American Naturalist 96, 361–373.
Lotka, A. J. (1932). The growth of mixed populations: Two species competing for a common food supply. Journal of the Washington Academy of Sciences 21, 461–469.
Maynard Smith, J. (1966). Sympatric speciation. American Naturalist 100, 637–650.
Mukai, T., Chigusa, S. T., Mettler, L. E. & Crow, J. F. (1972). Mutation rate and dominance of genes affecting viability in Drosophila melanogaster. Genetics 72, 335–355.
Stewart, F. M. & Levin, B. R. (1973). Partitioning of resources and the outcome of interspecific competition: a model and some general considerations. American Naturalist 107, 171–198.
Volterra, V. (1927). Variations and fluctuations in the numbers of coexisting animal species. Translation in The Golden Age of Theoretical Ecology (ed. Scudo, F. M. and Ziegler, J. R.). Berlin: Springer-Verlag.