1. N. A. Dollezhal' et al., in: Transactions of the 2nd Geneva Conference 1958, Papers of Soviet Scientists [in Russian], Vol. 2 Atomizdat, Moscow (1959), p. 36.
2. P. I. Aleshchenkov et al., At. Énerg.,16, 489 (1964).
3. M. Novick et al., in: Proc. 3rd Intern. Conf. Geneva, Vol. 6 (1965), p. 225.
4. F. Hoffmann and C. Rickard, ibid., in: Proc. 3rd Intern. Conf. Geneva, Vol. 5 (1965), p. 101.
5. C. A. Rennie et al., ibid., in: Proc. 3rd Intern. Conf. Geneva,Vol. 1 (1965), p. 318.