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Pyykkö, Pekka and Orama, Olli (1996). «What did Johan Gadolin actually do?»(PDF). Στο: Evans, C.H. Episodes from the History of the Rare Earth Elements. Dordrecht: Kluwer. σελίδες 1–12.CS1 maint: Πολλαπλές ονομασίες: authors list (link)