1. Avery, P. J., 1975, Extensions to the model of an infinite number of selectively neutral alleles in a finite population, Genet. Res. 25:145.
2. Ayala, F., Powell, J. R., Tracey, M. L., Mouras, C. A., and Perez-Salas, S., 1972, Enzyme variability in the Drosophila willistoni group. IV. Genetic variation in natural populations of Drosophila willistoni, Genetics 70:113.
3. Ayala, F. J., and Tracey, M. L., 1974, Genetic differentiation within and between species of the Drosophila willistoni group, Proc. Natl. Acad. Sci. USA 71:999.
4. Blundell, T. L., and Wood, S. P., 1975, Is the evolution of insulin Darwinian or due to selectively neutral mutation? Nature (London) 257:197.
5. Brown, A. H. D., Marshall, D. R., and Albrecht, L., 1975, Profiles of electrophoretic alleles in neutral populations Genet. Res. 25:137.