Publication on the History and Practice of Platinum and Palladium Printing: – British photographic history
Arch Enterprises a REFINER-Refinery of PGM Group Metals Platinum, Palladium, Rhodium, Ruthenium. www.ArchEnterprises.com - Precious Metal Refining Blog from Arch Enterprises – Gold & Silver Refiners
Palladium - Wikipedia
Platinum Vs. Palladium: A Key Factor Holding Back Platinum Demand And Price | Seeking Alpha
Bibliography of the Metals of the Platinum Group - Platinum, Palladium, Iridium, Rhodium, Osmium, Ruthenium (Hardcover) | Volumes Bookcafe