1. J. Ogden,Interdisciplinary Science Rev., 1992,17 (3), 261–270
2. C.J. Raub,Gold Bull., 1973,6, 51
3. J. Nutting and J.L. Nuttall,Gold Bull., 1977,10, 2–8
4. J.C. Wright and C.W. Corti,Proc. Santa Fe Symposium, 1997, 155-172; J.C. Wright and C.W. Corti,Gold Technology, No 23, April 1998, 27-34
5. M. DuToit,Proc. Santa Fe Symposium, 1997, 381-394