Ricci, M. dos S.F. et al. 2008. Diversity of weed community in agroforestry systems with coffee in Turrialba, Costa Rica. Pesquisa Agropecuaria Brasileira. 43, 7 (Oct. 2008), 825–834. DOI:https://doi.org/10.1590/S1678-3921.pab2008.v43.166.