Faccini, D. et al. 1992. Longevity of <i>Carduus nutans, Datura ferox, Anoda cristata</i> y <i>Sorghum halepense</i> seeds. Pesquisa Agropecuaria Brasileira. 27, 9 (Sep. 1992), 1379–1389. DOI:https://doi.org/10.1590/S1678-3921.pab1992.v27.3781.