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Gopalakrishnan, V and Srinath, EG (1963) Some experimental observations on the use of activated sludge as fertilizer for fish culture. In: Proceedings of the Indian Academy of Sciences - Section B, 57 (6). pp. 379-388.
Sathyanarayana Rao, S and Srinath, EG (1960) Influence of cobalt on the vitamin B12 contents of sewage sludges. In: Die Naturwissenschaften, 47 (22). p. 518.