Daffalla, Samah Babiker; Mukhtar, Hilmi; Shaharun, … - In: International Journal of Global Environmental Issues 12 (2012) 2/3/4, pp. 107-129
activation with zinc chloride (ZnCl<SUB align="right"><SMALL>2</SMALL></SUB>) and phosphoric acid (H<SUB align="right"><SMALL>3 …