1. Rare earths, statistics and information. https://minerals.usgs.gov/minerals/pubs/commodity/rare_earths/ (accessed August 21, 2017).
2. World Mineral Production 2008–12, Nottingham: British Geological Survey, 2014.
3. Fortier, S.M. and Gambogi, J., Global REE supply chains and material flow, in Proc. BOA 2nd Conf. European Rare Earth Resources (ERES 2017), Santorini, Greece, 2017, pp. 15–16.
4. Wall, F., The geology of rare earth deposits and its influence on choosing the best routes for processing, in Proc. BOA 2nd Conf. European Rare Earth Resources (ERES 2017), Santorini, Greece, 2017, pp. 17–18.
5. Bunzli, J.G., Rare earth applications: Moving ahead, in Proc. BOA 2nd Conf. European Rare Earth Resources (ERES 2017), Santorini, Greece, 2017, pp. 21–23.