Nazareno, Rodrigo Barbosa, et al. “Initial Growth of Rubi Coffee Plant in Response to Nitrogen, Phosphorus and Potassium and Water Regimes”. Pesquisa Agropecuaria Brasileira, vol. 38, no. 8, Aug. 2003, pp. 903-10, doi:10.1590/S1678-3921.pab2003.v38.6653.