1. Bessel, C. A.; See, R. F.; Jameson, D. L.; Churchill, M. R.; Takeuchi, K. J.J. Chem. Soc., Dalton Trans. 1992, 3228.
2. Julia, S.; Sala, P.; del Mazo, J.; Sancho, M.; Ochoa, C.; Elguero, J.; Fayet, J.-P.; Vertut, M.-C..J. Heterocyclic Chem. 1982,19, 1141.
3. Churchill, M. R.; Lashewycz, R. A.; Rotella, F. J..Inorg. Chem. 1977,16, 265.
4. Sheldrick, G. M.; SHELXTL PLUS, Siemens Analytical Instruments, Madison, WI (1989).
5. Sheldrick, G. M.; SHELXTL PLUS. An integrated system for solving, refining and displaying crystal structures from diffraction data. For Nicolet R3m/V, University of Göttingen, Germany, 1987.