de Oliveira, J.P. et al. 1994. Foliar diagnosis in citrus. II. Effect of cultivars and of leaf collecting quadrants on micronutrient amounts. Pesquisa Agropecuaria Brasileira. 29, 4 (Apr. 1994), 587–592. DOI:https://doi.org/10.1590/S1678-3921.pab1994.v29.4090.