Oliveira, J., E. González, P. Castro, and L. Costal-Andrade. “Short Communication. Effects of Endophyte Infection on Dry Matter Yield, Persistence and Nutritive Value of Perennial Ryegrass in Galicia (North-West Spain)”. Spanish Journal of Agricultural Research, Vol. 2, no. 4, Dec. 2004, pp. 558-63, doi:10.5424/sjar/2004024-112.