2012-1-1 · Sum EYL. Recovery of metals from electronic scrap. Journal of the Minerals Metals and Materials Society, 1991, 43:53-61.  Zhao Y, Wen X, Li B. Recovery of copper from waste printed circuit board. Journal of Minerals & Metallurgical Processing,2004,21:99-102.  Zhang S, Forssberg E. Electronic scrap characterization for materials recycling.