1. Das Franck-Condon-Prinzip und die Lichtabsorption von Merocyaninen
2. E. Daltrozzo, W. Sulger, 9th International Colour Symposium, Engelberg 1985, Abstracts p. 26;
3. E. Daltrozzo, PhD thesis, Technical University of Munich, 1965;
4. W. Sulger, PhD thesis, University of Konstanz, 1981.
5. Near-infrared absorbing dyes