Examination of Three Different Organic Waste Biochars as Soil Amendment for Metal-Contaminated Agricultural Soils - Hyuck Soo Kim; Kwon Rae Kim; Yong Sik Ok; Yeon Kyu Lee; Björn Kluge; Gerd Wessolek; Won Il Kim; Kye-Hoon Kim (Water, Air, & Soil Pollution, 2015)