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2. An Introduction to Nitrogen Fixation;Gallon,1987
3. Molecular and Genetic Aspects of Nitrate Assimilation;Wray,1989
4. Johnstone, I. L., MacCabe, P. C., Greaves, P., Cole, G. K., Brow, M. A. D., Gurr, S. J., Unkles, S. E., Clutterbuck, A. J., Kinghorn, J. R. and Innis, M. A. Gene (in press)
5. Molecular and Genetic Aspects of Nitrate Assimilation;Unkles,1989