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Nevenka Rajic , Djordje Stojakovic, Sanja Jevtic, Natasa Zabukovec Logar, Janez Kovac and Venceslav Kaucic
Removal of aqueous manganese using the natural zeolitic tuff from the Vranjska Banja deposit in Serbia
Journal of Hazardous Materials
Volume 172, Issues 2-3, 30 December 2009, Pages 1450-1457
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http://dx.doi.org/10.1016/j.jhazmat.2009.08.011