1. M.-J. Lehn, Supramolecular Chemistry, VCH, Weinheim, 1995.
2. Tautomerism in the Solid State
3. H. Zollinger, Color Chemistry: Syntheses, Properties and Applications of Organic Dyes and Pigments, VCH, Weinheim, 1991.
4. F.L. Carter (Ed.), Molecular Electronic Devices II, Marcel Decker, New York, 1987.
5. H. Durr, H. Bouas-Laurenet (Eds.), Photochromism: Molecules and Systems, Elsevier, Amsterdam, 1990.