Voll, Elemar, Dionísio L. P. Gazziero, and Décio Karam. 1997. “Population Dynamics of Acanthospermum Hispidum DC. Under Soil and Herbicide Management Practices”. Pesquisa Agropecuaria Brasileira 32 (9): 897-904. https://doi.org/10.1590/S1678-3921.pab1997.v32.4734.