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Richards, Jeremy P.; Wagner, Paul A.; Frei, Robert; Pettke, Thomas (1997). Mono-sample Pb-Pb dating of pyrrhotite and tourmaline: Proterozoic vs. Archean intracratonic gold mineralization: Comment and Reply. Geology, 25(7), pp. 669-671. Geological Society of America 10.1130/0091-7613(1997)025<0669:MSPPDO>2.3.CO;2