Ferreira, Gilvan Barbosa, Renildes Lúcio Ferreira Fontes, Victor Hugo Alvarez Venegas, Maurício Paulo Ferreira Fontes, and Juliana Maria Nogueira Pereira. 2002. “Interference of Iron on Soil Boron Determination With Azomethine-H in Acid Solutions”. Pesquisa Agropecuaria Brasileira 37 (9):1311-18. https://doi.org/10.1590/S1678-3921.pab2002.v37.6471.