1. F. E. Beamish, J. C. Van Loon,Recent Advances in the Analytical Chemistry of the Noble Metals, Pergamon Press, Oxford, 1972, p. 306.
2. F. E. Beamish,The Analytical Chemistry of the Noble Metals, Pergamon Press, Oxford, 1966, p. 363.
3. F. E. Beamish,Talanta,1965,12, 789.
4. D. F. Botz, M. G. Mellon,Anal. Chem. 1976,48, 216R;1974,46, 234R;1972,44, 300R;1970,42, 152R.
5. J. A. Howell, L. G. Hargis,Anal. Chem. 1982,54, 171R;1980,52, 306R;1978,50, 243R.