1. T. J. Kealy and P. L. Pauson, Nature, 1951, 168, 1039.
2. M. Rosenblum, Chemistry of the Iron Group Metallocenes, Interscience, New York 1965.
3. G. Wilkinson, J. Organomet. Chem. 1975, 100, 273.
4. J. S. Thayer, Adv. Organomet. Chem. 1975, 13, 1.
5. K. F. Purcell and J. C. Kotz, Inorganic Chemistry, W. B.Saunders, Philadelphia 1977, p. 877.