Brighenti, Alexandre Magno, Cesar de Castro, Dionísio Luiz Pisa Gazziero, Fernando Storniolo Adegas, and Elemar Voll. 2003. “Phytosociological Census of Weeds in the Sunflower Crop”. Pesquisa Agropecuaria Brasileira 38 (5):651-57. https://doi.org/10.1590/S1678-3921.pab2003.v38.6620.