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2. Appleby, C. A., Bergersen, F. J., MacNicol, P. K., Turner, G. L., Wittenberg, B. A., and Wittenberg, J. B. (1974) in Proceedings of the First International Symposium on Nitrogen Fixation (Newton, W. E. & Nyman, C. J., eds) Vol. 1, pp. 274–292, Washington State University Press, Pullman
3. Oxygen and Physiological Function;Wittenberg,1976