1. Adams, J B, and Drew, M E. 1964. Grain aphids in New Brunswick. I. Field development on oats. Can J Zool, 42, 735–740.
2. Ayala, E J. 1982. Genetic variation in natural populations: problems of electrophoretically cryptic alleles. Proc Natl Acad Sci USA, 79, 550–554.
3. Blackman, R L. 1990. Specificity in aphid-plant interactions with particular attention to the role of the alate colonizer. In: Campbell, R. K. and Eikenbary, R. D. (eds) Aphid-Plant Genotype Interactions, pp. 251–274. Elsevier, Amsterdam.
4. Blackman, R L, and Eastop, V F. 1984. Aphids on the World's Crops An Identification Guide. John Wiley and Sons, Chichester.
5. Boileau, M G, Hebert, P D N, and Schwartz, S S. 1992. Non-equilibrium gene frequency divergence: persistent founder effects in natural populations. J Evol Biol, 5, 25–39.