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US7489844B   [0009] 
US6091871A   [0010] 
US6167178A   [0011] 
US7522795B   [0012] 
US6030919A   [0049] 

Platinum Metals Rev.   [0049] 
CHEMICAL ABSTRACTS   [0094] 
CHEMICAL ABSTRACTS   [0094]  [0096]