1. N. S. Biradar, T. R. Goudar, V. B. Mahale, V. H. Kulkarni undM. A. Pujar, Proc. DAE, Symp.1, 321 (1970);N. S. Biradar undT. R. Goudar, Rev. Roum Chim.19, 14 (1974);M. Seyhan, Chem. Ber.85, 436 (1952);90, 218 (1957);S. Jamada undA. Takeuchi, Bull. Chem. Soc. [Japan]42, 2549 (1969);S. N. Poddar, K. Dey, J. Haldar undS. C. Nathsarkar, J. Indian Chem. Soc.47, 743 (1970);A. V. Bergan, K. S. Murry undB. O. West, Austral. J. Chem.25, 705 (1972);H. T. Andrew, R. M. Sheahan undB. O. West, Austral. J. Chem.28, 885 (1975);H. A. Tayim, M. Assi, A. Darwish undS. K. Thabet, Inorg. Nuclear Chem. Letters11, 395 (1975);R. G. Vijay undJ. P. Tandon, J. Inorg. Nucl. Chem.37, 2326 (1975).
2. M. Vidali, P. A. Vigato undU. Casellato, J. Inorg. Nucl. Chem.37, 955 (1975).
3. B. Il. Kim, C. Miyake undS. Imoto, J. Inorg. Nucl. Chem.37, 963 (1975).
4. N. S. Biradar undV. H. Kulkarni, Rev. Roum. Chim.16, 1203 (1971).
5. J. C. Duff, J. Chem. Soc. [London]1947, 547.