Costa, Carlos A. F., et al. “Effects of Housing, Type of Pasture and Roughage Supplementation on Nematode Parasitism in Goats”. Pesquisa Agropecuaria Brasileira, vol. 26, no. 4, Apr. 1991, pp. 521-33, doi:10.1590/S1678-3921.pab1991.v26.3373.