1. Administration of Technology Supervision 1996. National Standards for Integrated Waste Water (GB 8978 1996) (in Chinese).
2. AQS (General Administration of Quality Supervision, Inspection and Quarantine) and NSA (National Standardization Administration) 2012. Xitu Yelian Jiagong Qiye Danwei Chanpin Nengyuan Xiaohao Xian’e (baopigao) [The Norm of Energy Consumption per Unit Product of Rare Earth Metallurgical Enterprise].
3. BGS (British Geological Service) 2011. Rare earth elements. From 〈www.bgs.ac.uk/downloads/start.cfm?id=1638〉.
4. Buijs, B., Siverers, H. 2011. Critical thinking about critical minerals. Assessing risks related to resource security. From 〈www.clingendael.nl/publications/2011/20111111_ciep_bgr_briefingpaper_buijs_sievers_critical_thinking_about_critical_minerals.pdf〉
5. Limits to the critical raw materials approach;Buijs;Waste and Resource Management,2012