1. S. I. Zakharov et al., in: Disposal of Radioactive Wastes into the Ground, IAEA, Vienna (1967), p. 577.
2. N. N. Bykovskii et al., in: Problems of Radiation Monitoring and Radiometry of Ionizing Radiations [in Russian], (Yu. V. Sivintsev, editor), Gosatomizdat, Moscow (1961), p. 192.
3. T. Bruck and R. Ashley, Analyst,92, 137 (1967).
4. Symposium of Radiochemical and Dosimetric Methods [in Russian], N. Guseva et al. (editors), Medgiz, Moscow (1959).
5. I. V. Shpanov, Zh. Vses. Khim. O-va im. D. I. Mendeleeva,X, 43 (1965).