2) Y. Saijo: Nitrification mechanism in fresh water lake. Japan J. Wat. Pollut. Res., 6, 1-8 (1983).
3) W. Kaplan: Nitrificattion in “Nitrigen in the marine environment” (ed. by E. J. Carpenter and D. G. Capone), Academic Press, New York, 1983, pp. 139-190.