1. A. Foris (1977) In The Analytical Chemistry of Synthetic Dyes, ed. K. Venkataraman, Wiley, New York.
2. L.A. Fedorov (1987) NMR Spectroscopy of Organic and Analytical Reagents and Their Complexes with Metal Ions. Nauka, Moscow (in Russian).
3. A. Lyčka and J. Jirman (1991) In Color Chemistry, Ch. 10 ed. A.T. Peters and H.S. Freeman. Elsevier, London.
4. A. Lyčka (1993) Annu. Rep. NMR Spectr., 26 247.
5. C. Fyfe (1984) Solid State NMR for Chemists. CFC Press, Guelph.