1. Benecki WT (2013) The permanent magnet market–2015. In: Presentation on magnetics 2013 conference, Orlando, Florida, USA, 7–8 Feb 2013
2. Bradsher K (2011) Prices of rare earth metals declining sharply. New York Times, 16 Nov
3. Qi L, Yap CW (2014) China to appeal WTO rare-earth ruling group backed US, EU, Japan in complaint accusing beijing of violating trade rules. New York Times, 17 April 2014
4. http://www.researchinchina.com/Htmls/Report/2013/6714.html
5. Smith L (2012) The rare earth market, a monthly analysis for the rare earth industry. Core Consultants & Metal Pages, Aug 2013, p 15