1. Metals recycling: economic and environmental implications;Ayres;Resour Conserv Recycl,1997
2. The contemporary European copper cycle: waste management subsystem [J];Bertram;Ecol Econ,2002
3. Bi S. Will Copper Resources Be depleted? Futures Daily. April 25th, 2005.
4. The contemporary situation and prospects of the recycling of nonferrous metal resources in China;Cao;Aviso Met China,2006
5. Material flow analysis of Chinese economic environmental system;Chen;J Nat Resour,2000