F. Widmer, Porteous, L. A., Donegan, K. K., and Doyle, J. D.,
“Fate and transport of recombinant Sinorhizobium meliloti with enhanced N2-fixing abilities during a multiyear field trial with transgenic alfalfa”,
Proceedings of the 5th International Symposium on the Biosafety Results of Field Tests of Genetically Modified Plants and Microorganisms. Braunschweig, Germany, 1999.