1. Alexander, M.: Introduction to soil microbiology, 472 pp. London: John Wiley & Sons. Inc. 1961.
2. Ayyakkannu, K. and D. Chandramohan: On the occurrence and distribution of phosphobacteria in the marine environment at Porto Novo. Curr. Sci. 39, 398?399 (1970a)
3. ? and D. Chandramohan: Phosphatase activity in marine environments: open sandy beach at Porto Novo. Indian J. exp. Biol. 8, 349?350 (1970b).
4. Balasubramanyan, K.: Studies on the ecology of the Vellar estuary. 2. Phosphates in bottom sediments. J. zool. Soc. India 13, 166?169 (1961).
5. Carritt, D. E. and S. Goodgal: Sorption reactions and some ecological implications. Deep Sea Res. 1, 224?243 (1954).