1. Burrisf R. H. 1976. Nitrogen fixation. Ir\ J. Bonner and J. E. Varner (eds.). Plant Biochemistry, 3rd edition. p. 887–909. Academic Press. New York, NY.
2. Brill, W. J. 1979. Nitrogen fixation: basic to applied. American Scientist 67: 458–466.
3. Dobereiner, J., and J. M. Day. 1974. Associative symbioses in tropical grasses: characterization of microorganisms and dinitrogen-fixing sites. Iri Proc. 1st Intern. Symp. Nitrogen Fixation. W. E. Newton and C. J. Nyman (eds.) 2:518–38. Pullman: Washington State University Press.
4. Smith, R. L., J. H. Bouton, S. C. Shank, K. H. Quesenberry. 1976. Nitrogen fixation in grasses inoculated with Spirillum lipoferum. Science 193: 1003–1005.
5. Shank, S. C., and R. L. Smith. 1983. Status and evaluation of associative grass-bacteria N -fixing systems in Florida. Soil and Crop Sci. Soc. of Florida Proc. 42 (in press).