1. ?Untersuchungen zur Koppelung von Wasserstoff und Methanbildung im Faulschlamm.? Ph.D. Dissertation, Swiss Federal Institute of Technology, Zürich, Nr. 5984. (1977).
2. in Mixed Culture Fermentations, and (Eds.) (Academic Press, London, 1981), Chap. 3.
3. Anaerobic biotechnology for industrial wastewater treatment
4. and Biological Wastewater Treatment (Marcel Dekker, New York, 1980).