Vitorino, Hermeson dos Santos, et al. “Water Stress on the Performace of Herbicides and Biochemical Characteristics of Euphorbia Heterophylla”. Semina: Ciências Agrárias, vol. 34, no. 1, Mar. 2013, pp. 19-28, doi:10.5433/1679-0359.2013v34n1p19.