Maia, A.A.M. and Guimarães, M.P. (2014) “Seasonal variation in gastrointestinal helminth infection of beef cows and effect of Ivermecthrin at different intervals”, Pesquisa Agropecuaria Brasileira, 21(10), pp. 1085–1088. doi:10.1590/S1678-3921.pab1986.v21.15045.