1. Aiken, G. R., McKnight, D. M., Wershaw, R. L., and MacCarthy, P., 1985, Humic Substances in Soil, Sediment and Water, Wiley, New York.
2. Akagi, Y., Taga, N., and Simidu, U., 1977, Isolation and distribution of oligotrophic marine bacteria, Can. J. Microbiol. 23: 981–987.
3. Alexander, M., 1965, Biodegradation: Problems of molecular recalcitrance and microbial fallibility, Adv. Appl. Microbiol. 7: 35–76.
4. Alexander, M., 1973, Non biodegradable and other recalcitrant molecules, Biotechnol. Bioeng. 15: 611–647.
5. Ammerman, J. W., Fuhrman, J. A., Hagström, A., and Azam, F., 1984, Bacterioplankton growth in seawater: 1. Growth kinetics and cellular characteristics in seawater cultures, Mar. Ecol. Prog. Ser. 18: 31–39.