Pimenta, C.J. et al. 1997. Polyphenoloxidase, leaching of potassium and quality of coffee picked at maturation stages. Pesquisa Agropecuaria Brasileira. 32, 2 (Feb. 1997), 171–177. DOI:https://doi.org/10.1590/S1678-3921.pab1997.v32.4621.