1. Part of the PhD thesis of University of Munich, 1995.
2. [3a] , , Synthetic Chemistry of Stable Nitroxidvs, CRC Press, Boca Raton, 1994.
3. [3b] — in Nitrones, Nitronates and Nitroxides (Ed.: ), Wiley & Sons Ltd, London, 1989, chapter 4 and 5.
4. Newer aspects of the synthesis and chemistry of nitroxide spin labels
5. [3d] — Free Nitroxyl Radicals, Plenum Press, New York, 1970.