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3. Ahlberg, M., Akselsson, R., Forkman, B. (1976): Gold traces on wedge-shaped artifacts from the late Neolithic of Southern Scandinavia analysed by proton-induced X-ray emission spectroscopy. Part II. Analysis of wedge-shaped pendants by PIXE.- Archaeometry 18 (1): 42–49.
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5. Anonymous (1993): Goldgestein genauer nachweisbar.- Frankfurter Allgemeine Zeitung, 8.9.93.