1. Fischer, E. O., and Fritz, H. P., in “Advances in Inorganic Chemistry and Radiochemistry”, 1, 55 (Academic Press, Inc., New York, 1959).
2. Wilkinson, G., and Cotton, F. A., in “Progress in Inorganic Chemistry”, 1, 1 (Interscience Publishers, Inc., New York, 1959).
3. Ruch, E., “Ber. Jahrestagung Chem. Ges. DDR, Leipzig”, 125 (1959).
4. Fischer, E. O., Internat. Conf. Co-ord. Chem., London, April 1959, 73. Special Publication No. 13, The Chemical Society, London (1959).
5. Fritz, H. P., and Lüttke, W., Internat. Conf. Co-ord. Chem., London, April, 123. Special publication No. 13, The Chemical Society, London (1959). See also ref. 1, p. 105.