Martinez, Herminia E. P., et al. “Micronutrients in Pinus Caribaea Morelet. III. Corresponding, Fe, Mn and Zn Sufficiency and Deficiency Internal Levels”. Pesquisa Agropecuaria Brasileira, vol. 27, no. 9, Sept. 1992, pp. 1339-53, https://doi.org/10.1590/S1678-3921.pab1992.v27.3777.