de Bruijn, F. J., Rossbach, S., Schneider, M., Ratet, P., Messmer, S., Szeto, W. W., . . . Schell, J. (1989). Rhizobium meliloti 1021 has three differentially regulated loci involved in glutamine biosynthesis, none of which is essential for symbiotic nitrogen fixation.

de Bruijn, F J., S. Rossbach, M. Schneider, P. Ratet, S. Messmer, W W. Szeto, F M. Ausubel, and J. Schell. Rhizobium Meliloti 1021 Has Three Differentially Regulated Loci Involved in Glutamine Biosynthesis, None of Which Is Essential for Symbiotic Nitrogen Fixation. 1989.

de Bruijn, F J., et al. Rhizobium Meliloti 1021 Has Three Differentially Regulated Loci Involved in Glutamine Biosynthesis, None of Which Is Essential for Symbiotic Nitrogen Fixation. 1989.