Found in articles
suggested) (help) Hunziker, O F (1 March 1929). "Metals in Dairy Equipment. Metallic Corrosion in Milk Products and its Effect on Flavor" (PDF). Journal of
J.W.; Dunlap, BI; White, CT (3 February 1992). "Are Fullerene Tubules Metallic?". Physical Review Letters. 68 (5): 631–634. doi:10.1103/PhysRevLett.68