Fenerich, Flávio Luiz, et al. “Seasonal Variation of the Gastrointestinal Nematode Larvae of Bovine Cattle in the Region of Campinas, Brazil”. Pesquisa Agropecuaria Brasileira, vol. 22, no. 5, Apr. 2014, pp. 505-11, doi:10.1590/S1678-3921.pab1987.v22.14374.