OOI, Shin-Leei, and Siew-Teng ONG. “REMEDIATION OF LEAD (II) AND MALACHITE GREEN FROM AQUEOUS SOLUTION USING PALM OIL FRUIT FIBRE”. Studia Universitatis Babeș-Bolyai Chemia, vol. 64, no. 4, Dec. 2019, pp. 55-70, doi:10.24193/subbchem.2019.4.05.