1. Ayers, W. A... “Specificity of the vitamin B12 requirement of certain marine bacteria,”J. Bact., 1960,80, 744–52.
2. Baam, R. B. .. “Studies on the production of antibiotics by micro-organisms from marine sources,”M.Sc. Thesis, Univ. of Bombay, 1962.
3. Bennett, R. E. .. U.S. Patent,2, 681, 881. Quoted inChem. Absts., 1954,48, 11735.
4. Burton, M. O. and Lochhead, A. G... “Studies on production of vitamin B12 active substances by micro-organisms,”Canad. J. Bot., 1951,29 (4), 352–59.
5. Chatterjee, A. N., Maitre, P. K., Ganguly, S. and Roy, S. C. “Defatted mustard seed cake in microbial synthesis of vitamin B12,”Proc. 44th Ind. Sci. Congr., Part III, 1957, pp. 142.