1. R. M. German,Journal of Dental Research, 1980,59, 1960
2. R. van Noort, ‘Introduction to Dental Materials’, Mosby, London, 1994, pp. 219–221
3. R. M. German,International Metals Reviews, 1982,27, 260
4. H. Knosp, R. J. Holliday, C. W. Corti,Gold Bulletin, 2003,36, 93
5. R. M. German, M. M. Guzowski, D. C. Wright,Journal of Metals, 1980,32, 20