1. D. Wilcox and L. Bromley, Industr. and Engng. Chem.,53, 37 (1963).
2. S. A. Shukarev, General Chemistry Course [in Russian], Vol. 2 (1967), p. 125.
3. D. Wagman, Nat. Bur. Stand. Report No. 7437 (1962); cited by J. Jeffes and H. McKerrell in J. Iron and Steel Instr.,202, 669 (1964).
4. V. V. Akhachinskii and L. M. Kopytin, At. Énerg.,9, 504 (1960).
5. C. Shomate and E. Huffman, J. Amer. Chem. Soc.,65, 1625 (1943).