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WikiPedia: Nhóm_platin http://www.kitco.com/market/ http://www.platinum.matthey.com/ http://www.pgmdatabase.com/ http://www.platinummetalsreview.com/ http://minerals.usgs.gov/minerals/pubs/commodity/p... //dx.doi.org/10.1002%2F14356007.a21_075 https://www.accenture.com/us-en/insight-final-obst... https://books.google.com/books?id=mELwAAAAMAAJ