1. and Planta Medica, in press (1985).
2. and '13C NMR-Spectroscopy, Methods and Applications,' in Monographs in Modern Chemistry, edited by Vol 5. Verlag Chemie, Weinheim (1974).
3. 'Carbon-13 NMR Spectroscopy,' in Organic Chemistry. A Series of Monographs, edited by and Vol. 24. Academic Press, New York, London (1972).
4. Dissertation, Universität Bonn (1979).
5. Computer supported structure elucidation of polymethoxy- and polyacetoxyxanthones. V—13C NMR spectroscopy of substituted xanthones