1. S. L. Maxwell, Radioact. Radiochem., 8 (1997) 4.
2. M. F. L’Annunziata, Handbook of Radioactivity Analysis, Academic Press, Chap. 4, 1998, p. 210.
3. E. Holm, Appl. Radiation Isotopes, 35 (1984) 285.
4. E. P. Horwitz, M. L. Dietz, R. Chiarizia, H. Diamond, S. L. Maxwell III, M. R. Nelson, Anal. Chim. Acta, 310 (1995) 63.
5. C. J. Passo Jr., G. T. Cook, Handbook of Environmental Liquid Scintillation Spectrometry, Packard Instrument Company, Meriden, C. T. USA, 1994, p. 3–1.