Eichler, A., Gramlich, G., Kellerhals, T., Tobler, L., Rehren, T. and Schwikowski, M. 2018. Ice-Core Evidence of Earliest Extensive Copper Metallurgy in the Andes 2700 Years ago: Highlights of Analytical Sciences in Switzerland. CHIMIA. 72, 3 (Mar. 2018), 152. DOI:https://doi.org/10.2533/chimia.2018.152.