1. Thiers, R. E., in: Trace Analysis (Yoe, J. H. andH. J. Koch, Edts), pp. 645–647 (New York 1957).
2. Starik, I. E., Osnovy Radiokhimiyi (Principles of Radiochemistry), pp. 42, 54, 62, 424 (Leningrad 1969); Grundlagen der Radiochemie pp. 3, 28, 31, 260 (Berlin 1963).
3. Martin, D. F., Marine Chemistry, pp. 11–14 (New York 1968).
4. Berneš, P. andJ. Smetana, Coll. Czech. Chem. Commun.34, 1360 (1969).
5. Starik, I. E., V. N. Shcsebetkovskii, andI. A. Skulskii, Radiokhimiya4, 393 (1962).