0 Reeves, R.D. Brooks, R.R. 1979 Trace element Analysis of Geological Materials R.D.Reeves, R.R.Brooks Chemical Analysis: A Series of Monographs on Analytical Chemistry and Its Applications NY/Chichester/Brisbane/Toronto John Wiley &sons 51 363-373 Trace element Analysis Geological Materials solo paragrafo 17.5 (""Archaeology"")"