1. J. C. Bailar, Jr., undE. M. Jones, Inorganic Syntheses, Vol. 1. New York: McGraw Hill Book Co. 1939.
2. S. Lacroix, Ann. chim.4, 5 (1943).
3. S. Lacroix, Bull. soc. chim. France1947, 408.
4. N. K. Dutt undSur Bimanes, Z. anorg. Chem.293, 195 (1957).
5. A. K. Babko undL. I. Dubovenko, Zhur. Neorg. Khim.2, 1294 (1957).