1. Internal Atomic Energy Agency, IAEA Bulletin, 33 (1992) No2
2. V. M. GAVRILOV, Z. G. GRITCHENKO, L. M. IVANOVA, T. E. ORLOVA, V. P. TISHKOV, D. N. A. TISHKOVA, Radiokhimiya, 32 (1989) 171.
3. R. M. PARR, A. ABDULLA, Proc. ISTERH 3rd Intern. Conf. and NTES 4 th Nordic Conf. on Trace Elements in Health and Disease, Hugginge, Sweden, 1992.
4. A. V. ZELENSKY, M. G. BUZINNY, I. P. LOS, Proc. Intern. Conf. on Advances in Liquid Scintillation Spectrometry, Vienna, Austria, 1992.
5. M. B. H. AL-BEDRI, S. AL-JOBORI, J. Radioanal. Nuc. Chem., 147 (1991) 235.