1. B. Schweig:Mirrors-A Guide to the Manufacture of Mirrors and Reflecting Surfaces, Pelham Books, London, 1973.
2. N. Barnard:Bronze Casting and Bronze Alloys in Ancient China, Monumenta Sinica Monograph, Canberra, 1961.
3. P. T. Craddoch: Private communication.
4. V. Biringuccio:Pirotechnia, Venice (1540), p. 388, translation from the Italian by C. S. Smith and M. T. Gnudi, MIT Press, 1966.
5. M. Chikashige: “Relations between the Color and the Fine Structure of Alloys,”Z. anorg. Chem., 1922, vol. 120, p. 45.