E. J. Pegoraro, C. H. E. C. Poli, P. C. de F. Carvalho, M. J. T. de M. Gomes, and V. Fischer, “Italian ryegrass management, pasture larval contamination and parasitic infection in sheep”, PAB, vol. 43, no. 10, pp. 1397–1403, Oct. 2008.