1. R.D. Reeves and R.R. Brooks, Trace Element Analysis of Geological Materials, Wiley, New York, 1978.
2. Analytical Chemistry in the Exploration, Mining and Processing of Materials. Eds.A.Strasheim and T.W.Steele, Butterworths, London, 1978.
3. A.K. Rusanov, Principles of Quantitative Spectrochemical Analysis of Ores and Minerals, 2nd ed., “Nedra”, Moscow, 1978 (Russian);
4. M. Pinta. Modern Methods for Trace Element Analysis. Ann Arbor Science Publishers, Ann Arbor, 1978.
5. W. Schrän, Wiss.Z.Karl-Marx-Universitat, Leipzig, Math.-naturwiss. R., 28, No. 4, 433 (1979).