Johnson, L., Steringa, M., Koulman, A., Christensen, M., Johnson, R., Voisey, C., Bryan, G., Lamont, I. and Rasmussen, S. (2007) “Biosynthesis of an extracellular siderophore is essential for maintenance of mutualistic endophyte-grass symbioses”, NZGA: Research and Practice Series, 13, pp. 177–179. doi: 10.33584/rps.13.2006.3054.