de Oliveira JP, de Carvalho JG, Malavolta E, de Paula MB, de Souza M, Guilherme LRG. Foliar diagnosis in citrus. II. Effect of cultivars and of leaf collecting quadrants on micronutrient amounts. PAB. 1994;29(4):587-592. doi:10.1590/S1678-3921.pab1994.v29.4090