1. Part III: , Liebigs Ann. Chem. 1994, 927–930.
2. Diploma Thesis, University of Marburg, 1993.
3. from the planned Dissertation, University of Marburg, 1995.
4. Laser Dyes in Ullmann's Encyclopedia of Industrial Chemistry, 5th ed., VCH, Weinheim, 1990, vol. A15, p 151–164.