Crispim, Sandra Mara Araújo, et al. “Stubble Manipulation in a Herbaceous Comunity of a Thinned Caatinga in Central sertão of Ceará”. Pesquisa Agropecuaria Brasileira, vol. 25, no. 7, Apr. 2014, pp. 1039-45, doi:10.1590/S1678-3921.pab1990.v25.13550.