1. Descamp, A...Bull. Soc. Chim., 1881,31 (2), 1879;Ann. Chim. Phys.,24 (5), 78 (1881).
2. Manchot, W. and Herzog, J.Ber., 1900,33, 1742.
3. Grube, G...Z. Elektrochem., 1926,32, 561.
4. Szego, L. and Ostinelli, P.Gazz. Chem. ital., 1930,60, 946.
5. Sartori, G... Ibid., 1936,66, 688.