1. Holden, F.C.; Douglass, R.W.; Jaffee, R.I. (ASTM Spec. Tech. Publ. No. 272 [1960] 68/79).
2. Jaffee, R.I.; Maykuth, W.; Douglass, R.W. (Proc. Am. Inst. Mech. Eng. Conf., Detroit 1960 ).
3. Metal Progress Data Sheet (Properties of Noble Metals).
4. Anonymous (Platinum Metals Rev. 16 [1972] 59).
5. Engelhard Ind. Inc. (Tech. Bull. VI.3 [1965]).