1. J. A. Donaldson,Gold Bull., 1980,13, (3), 117–124 and (4), 160–165
2. W. Hoffmann-Axthelm, ‘Die Geschichte der Zahnheilkunde’, Buch- und Zeitschriften-Verlag ‘Die Quintessenz’, Berlin, 1973
3. D. Potts, ‘Gold 1980’, Consolidated Gold Fields Limited, London, 1980
4. See, for example: American National Standards Institute/American Dental Association Specification No. 5 for Dental Casting Gold Alloys, in ‘Guide to Dental Materials and Devices’, 7th edition, American Dental Association, Chicago, IL., 1974, pp. 184–187
5. H. Knosp,Degussa-Brief, 1979,45, 34–40