1. Metallurgy of micro alloyed 24 carat golds;Corti;Gold Bull,1999
2. Microalloying of high carat gold, platinum and silver;Corti,2005
3. 22k Gold alloy compositions;Taylor;United States Patent,2002
4. Hardening of low-alloyed gold;Fischer-Bühner;Gold Bull,2005
5. Progold Srl, Hardenable 22 Carats gold alloy, World Gold Council, Vizenca, available from: http://www.progold.com/documents/publication/WGC2004eng.pdf.