1. J.S. Sohn, D.H. Yang, S.M. Shin, N.H. Kim, H.T. Sohn, Recovery of cobalt in sulfuric acid leaching solution using oxalic acid, in: K.I. Rhee, J.K. Oh (Eds.), in: Proceedings of the International Symposium on Green Technology for Resources and Material Recycling, November 24–27, 2004, Seoul, Korea, pp. 316–320.
2. P.V.D. Bossche, The current legislative development in the EU waste policy: challenge or opportunities for metal industry, Cobalt Development Institute, January 2006. http://www.thecdi.com/cdi/images/news_pdf/Cobalt_News_January_2006.pdf.
3. A laboratory-scale lithium-ion battery recycling process
4. D. Tong, Q. Lai, X. Ji, Huagong Xuebao 56(10) (2005) 1967–1970 (Chinese edition).
5. Reductive leaching of cathodic active materials from lithium ion battery wastes