3Jenny F. So and Emma C. Bunker,Traders and Raiders on China's Northern Frontier,Smithsonian Institu- tion,Washington D. C., 1995.
4ITRI,Tin and Tin Alloy Coatings,No.625,Middle- sex:International Tin Research Institute,1983:5- 19.
5Oddy,W. A. and Bimson,M.,Tinned Bronze in A ntiquity,United Kingdom Institute of Conservation, Occasional Paper No.3,1985 : 33-39.
6Hedges, E. S., Tin and Its Alloys,ch.5,London:Edward Arnold, 1960.
7Kinnes,L A.,Craddock,P. T.,Needham,S. and Lang,J.,Tin-plating in the Early Bronze Age:The Barton Stacey Axe,Antiquity LIII,208,1979:141.
8Hedges, E. S., Tin in Social and Economic History, London:Edward Arnold,1964.
9Craddock,P. T.,Re- port on the Composition of 19 Etruscan Bronze Mirrors from Danish Museums,Corpus Speculorum Etruscornm,Denmark 1,the Danish National Muse- um,Odense University Press, 1981.
10N. D. Meeks,Tin-rich Surfaces on Bronze-some Ex- perimental and Archaeological Considerations,Ar- chaeometry, 28 ( 2 ), 1986 : 132.
