Martins, M.L.A. et al. 2007. Characteristics of green and ripe umbu marmalades and acceptance by consumers. Pesquisa Agropecuaria Brasileira. 42, 9 (Sep. 2007), 1329–1333. DOI:https://doi.org/10.1590/S1678-3921.pab2007.v42.7701.