Fletcher, L., S. Easton, A. Popay, B. Tapper, and D. Hume. “Plant and Endophyte Genotype Affects Peramine Concentrations in ryegrass/Endophyte Associations”. NZGA: Research and Practice Series, vol. 12, Jan. 2006, pp. 93-96, doi:10.33584/rps.12.2006.3019.