Ludemann, C.I., C.M. Wims, and D.F. Chapman. “Validation of Perennial Ryegrass Cultivar Forage Value Index Rankings Using Independent Trial Data”. Journal of New Zealand Grasslands 79 (January 1, 2017): 97–101. Accessed July 29, 2026. https://www.nzgajournal.org.nz/index.php/JoNZG/article/view/562.