Gillingham, A.G., G.W. Sheath, M.H. Gray, and R.W. Webby. “Management and Nitrogen Fertiliser Options for Increased Pasture Productivity in Dryland Hill Systems”. NZGA: Research and Practice Series 11 (January 1, 2003): 43–49. Accessed June 12, 2026. https://www.nzgajournal.org.nz/index.php/rps/article/view/3002.