1. C. D. Garner and J. M.Charnock , in Comprehensive Coordination Chemistry , ed. G. Wilkinson , R. D. Gillard and J. A. McCleverty , Pergamon , Oxford , 1987 , ch. 36.4
2. E. I. Stiefel , in Comprehensive Coordination Chemistry , ed. G. Wilkinson , R. D. Gillard and J. A. McCleverty , Pergamon , Oxford , 1987
3. G. J. Leigh and R. L.Richards , in Comprehensive Coordination Chemistry , ed. G. Wilkinson , R. D. Gillard and J. A. McCleverty , Pergamon , Oxford , 1987
4. C. G. Young , in Comprehensive Coordination Chemistry II , ed. J. A. McCleverty and T. J. Meyer , Elsevier , Oxford , 2004 , Vol. 4, Section 4.7