1. Gregory, P.: Chapter 9.12. In: McCleverty, J.A., Meyer, T.J., (eds.) Comprehensive Coordination Chemistry II: From Biology to Nanotechnology, 2nd edn., vol. 9. Elsevier, Oxford, (2005)
2. Sekar, N.: Colourage 47(4), 27–28 (2000). 35
3. Hannemann, K.: Int. Dyer 186(3), 16–19 (2001)
4. Price, R.: Dyes and pigments. In: Wilkinson, G. (ed.) Comprehensive Coordination Chemistry, pp. 35–94. Pergamon, Oxford (1987)
5. Adams, H., Bucknall, R.M., Fenton, D.E., Garcia, M., Oaks, J.: Polyhedron 17(23–24), 4169–4177 (1998)