Bluett, S.J., J. Hodgson, P.D. Kemp, and T.N. Barry. 1999. “Performance of Lambs and the Incidence of Staggers and Heat Stress on Two Perennial Ryegrass Cultivars over Three Summers in the Manawatu”. NZGA: Research and Practice Series 7 (January):143-50. https://doi.org/10.33584/rps.7.1999.3383.