Maluf, A. M. (1999). Intraspecific competition between <i>Amaranthus hybridus</i> L. and <i>A. viridis</i> L. Pesquisa Agropecuaria Brasileira, 34(8), 1319–1325. https://doi.org/10.1590/S1678-3921.pab1999.v34.5370