1. Fischer, E.O. et al, J. Organomet. Chem., 1969, 18, P26 (synth)
2. Guggenberger, L.S. et al, Inorg. Chem., 1973, 12, 1143.
3. Huttner, G. et al, J. Organomet. Chem., 1973, 47, 383 (cryst struct)
4. Ellis, J.E. et al, J. Am. Chem. Soc., 1983, 105, 2296 (synth)
5. Fischer, E.O. et al, Chem. Ber., 1969, 102, 2547 (synth)