Y. Iii, M. Mellbye, T. Silberstein, G. Gingrich, A. Craig, and L. Blythe, “Endophyte fungus levels in perennial ryegrass and tall fescuse varieties grown for seed in Oregon, USA - implications for responsible grass straw use as livestock feed”, NZGA R&P Series, vol. 13, pp. 275–276, Jan. 2007.