Baldwin J E and Huff J 1973J. Am. Chem. Soc. 95 5757
Bancroft G M, Maddock A G, Ong W K, Prince R H and Stone A J 1967J. Chem. Soc. (A) 1966
Barnum D W 1961J. Inorg. Nucl. Chem. 21 221
Collman J P, Gagne R P, Reed C A, Halbert T R, Long G and Robinson W T 1975J. Am. Chem. Soc. 97 1427
Cotton F A 1972Coord. Chem. Rev. 8 185
Edwards P R and Johnson C E 1968J. Chem. Phys. 49 211
Greenwood N N and Gibb T C 1971Mössbauer spectroscopy (London: Chapman and Hall) p. 159.
Piper T S and Carlin R LInorg. Chem. 2 260
Tucker I, Singh R P and Zacharias P S 1979Indian J. Chem. A17 368
Zacharias P S and Chakravorty A 1971Inorg. Chem. 10 1961