1. Naturally Occurring 2,5-Dioxopiperazines and Related Compounds
2. Recent Advances in Pyazine Chemistry
3. and Carbon-13 Nuclear Magnetic Resonance for Organic Chemists, p. 96. Wiley-Interscience, New York (1972).
4. Carbon-13 NMR Spectroscopy, pp. 202, 239, 321 and 343. Academic Press, New York (1972).
5. and 13C NMR Spectroscopy, pp. 93 and 182. Verlag Chemie, Weinheim (1974).