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VARVARA, S. .; POPA, M. .; BOSTAN, R. .; LANCRANJAN, A. .; MOLDOVAN, M. .; ROŞU, C. . PRELIMINARY CONSIDERATIONS ON THE REMOVAL OF Fe, Zn AND Mn IONS FROM ACIDIC MINE DRAINAGE USING HYDROXYAPATITE. Studia UBB Ambientum 2015, 60, 145-153.