ŠTEFUŠOVÁ, KATARÍNA, MICHAL LOVÁS, ANTON ZUBRIK, MAREK MATIK, and MIROSLAVA VÁCLAVÍKOVÁ. 2012. “Removal of Cd2+ And Pb2+ from Aqueous Solutions Using Bio-Char Residues”. Nova Biotechnologica Et Chimica 11 (2):139-46. https://doi.org/10.2478/v10296-012-0016-x.