1. C.C. Allen: The Platinum Metals, Mineral Resources Division, Ottawa, 1960, Mineral Report No. 3, p. 7
2. R.E. Kirk and D.F. Othmer: Encyclopaedia of Chemical Technology, 3rd ed., vol. 18, Wiley Publications, New York, 1973, p. 228
3. R.W. Hesse: Jewellery making through history: An Encyclopaedia, Greenwood Publishing Group, Connecticut, 2007, pp. 146
4. R. Ruhela, A.K Sing, B.S. Tomar, and R.C Hubi: RSC Adv., 2014, vol. 4 (44), pp. 23433–50
5. A. Omoto, K, Moriya, and H. Karasawa: Nucl. Eng. Des., 2000, vol. 197(3), pp. 281–99