Faccini, Delma E., and Luisa A. Nisensohn. “<i>Amaranthus quitensis< i> Population Dynamics. Influence of Chemical and Mechanical Treatments in a Soybean Crop”. Pesquisa Agropecuaria Brasileira, vol. 29, no. 7, July 1994, pp. 1041-50, doi:10.1590/S1678-3921.pab1994.v29.4146.