1. G. N. Flerov et al., At. Energ.,53, No. 4, 255 (1982).
2. G. N. Flerov and V. Ya. Vyropaev, in: Proceedings of the Second Conference on the Use of New Nuclear-Physics Methods in Scientific and Economic Tasks [in Russian], JINR, D14-9779, Dubna (1976), p. 5.
3. Vo Dak Bang et al., Commun. JINR, 18-80-107, Dubna (1980).
4. N. G. Gusev et al., Protection from the Radiation from Extended Sources [in Russian], Atomizdat, Moscow (1961), p. 25.
5. T. V. Bazarkina et al., Commun. JINR, 18-12629, Dubna (1979).