Elemental analysis of Celtic coins. Nucl. Instrum. Methods Phys. Res. Sect. B Beam Interact. Mater. At. 1984, 3, 416–418. [Google Scholar] [CrossRef] Northover, J.P.; Salter, C.J. Decorative metallurgy of the celts. Mater. Charact. 1990, 25, 109–123. [Google Scholar] [Cross...