1. Ahmadjian, V., and Paracer, S., 1986, Symbiosis: An Introduction to Biological Associations, University Press of New England, Hanover.
2. Albers, D., Reisser, W., and Weissner, W., 1982, Studies on the nitrogen supply of endosymbiotic Chlorellae in green Paramecium bursaria, Plant Sci. Lett. 25:85–90.
3. Alexander, H. M., 1990, Dynamics of plant-pathogen interactions in natural plant communities, in: Pests, Pathogens and Plant Communities (J. J. Burdon and S. R. Leather, eds.), Blackwell, Oxford, pp. 31–45.
4. Allison, M. J., and Reddy, C. A., 1984, Adaptations of gastrointestinal bacteria in response to changes in dietary oxalate and nitrate, in: Current Perspectives in Microbial Ecology (M. J. Klug and C. A. Reddy, eds.), American Society for Microbiology, Washington, D.C., pp. 248–256.
5. Alverdy, J. C., 1990, Effects of glutamine-supplemented diets on immunology of the gut, J. Parent. Ent. Nutr. 14(Suppl.):109–113.