Joelington do C. Conceição, Antônio Santos Silva, Antônio Wilson M. de C. Costa, Antônio Wilson M. de C. Costa, Edilson de Jesus, and Victor Hugo S. Ramos, “Biosortion of Cr(VI) from Aqueous Solutions Using Chemically Modified Okra Powder”, J. Basic Appl. Sci., vol. 10, pp. 73–79, Oct. 2021.