1. Barthel, F., Dahlkamp, F., 1992. Thorium deposits and their availability, IAEA-TECDOC-650. In: New Developments in Uranium Exploration, Resources, Production and Demand, pp. 104–115. Available at: 〈http://www-pub.iaea.org/MTCD/publications/PDF/te_0650.pdf〉.
2. Darling, P., 2011. SME Mining Engineering Handbook, vol. 1. Society for Mining, Metallurgy and Exploration. SME, Englewood.
3. Ferron, C.J., Bulatovic, S.M., Salter, R.S., 1991. Beneficiation of rare earth oxide minerals. In: Materials Science Forum, vol. 70. Trans Tech. Publications, Pfaffikon, pp. 251-270. http:dx.doi.org/10.4028/www.scientific.net/msf.70-72.251.
4. Gambogi, J., 2013. Thorium. Minerals Yearbook 2011, pp. 76.1–76.3. Available at: 〈http://minerals.usgs.gov/minerals/pubs/commodity/thorium/myb1-2011-thori.pdf〉 (accessed 30.07.2013).
5. Chemical Engineers׳ Handbook;Green,2008