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[1] Ediriweera R N and Perera S I. Heat treatment of Geuda stones-spectral investigation. J Gemm, 1989, 21(7): 403~404
[2] Hughes R. Corundum. London; Butterworth -Heinemann, 1990.1~314
[3] Hurlbut Jr C S and Kammerling R C (eds). Gemology (2nd edn). New York: John Wiley & Sons, 1991. 1~336.
[4] Nassau K. Gemstone enhancement. London: Butterworth-Heinemann, 1984
[5] Themelis T. The heat treatment of ruby and sapphire. Houston; Gemlab Inc, 1992, 1~236
[6] Webster R. Gems (5th edn). Oxford: Butterworth- Heine-mann,1994. 1~1026
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