Johnston, Andrew W. B., Yeoman, Kay H. and Wexler, Margaret (2001) Metals and the rhizobial-legume symbiosis - Uptake, utilization and signalling. Advances in Microbial Physiology, 45. pp. 113-156.
Wexler, Margaret, Yeoman, Kay H., Stevens, James B., de Luca, Nicola G., Sawers, Gary and Johnston, Andrew W. B. (2001) The Rhizobium leguminosarum tonB gene is required for the uptake of siderophore and haem as sources of iron. Molecular Microbiology, 41 (4). pp. 801-816. ISSN 0950-382X