Martinez, Herminia E. P., Henrique Paulo Haag, and Mário L.T Moraes. 1992. “Micronutrients in <i>Pinus caribaea< i> Morelet. III. Corresponding, Fe, Mn and Zn Sufficiency and Deficiency Internal Levels”. Pesquisa Agropecuaria Brasileira 27 (9):1339-53. https://doi.org/10.1590/S1678-3921.pab1992.v27.3777.