1. M. T. Weller , T. I.Overton , J. P.Rourke and F. A.Armstrong , Inorganic Chemistry , Oxford University Press , Oxford , 2018
2. M. Gerloch and R. C.Slade , Ligand-Field Parameters , Cambridge University Press , Cambridge , 1973
3. A. B. P. Lever , Inorganic Electronic Spectroscopy , Elsevier , New York , 2nd edn, 1984
4. A. J. Bridgeman and M.Gerloch , in Prog. Inorg. Chem., Vol 45 , ed. K. D. Karlin , 1997 , vol. 45 , pp. 179–281
5. The electronic spectra of tetragonal metal complexes analysis and significance