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2. H.P. Littledale, ‘A New Process of Hard-Soldering and its Possible Connection with the Methods used by Ancient Greeks and Etruscans, Lecture IV, Worshipful Company of Goldsmiths, 1936; UK Patent 415, 181; 1934
3. E. Brepohl, ‘Theorei und Pravis des Goldschmidts’ (Theory and Practice for Goldsmiths), 8. Auflage, VEB Fachverlag, Leipzig, 1987
4. H. Moesta, ‘Erze und Metalle’ (Ores and Metals), Springer-Verlag, Berlin/Heidelberg/New York, 1983
5. P.M. Roberts,Gold Bull., 1973,6, 112