1. Geological significance of sulphur oxidoreduction by bacteria
2. The bacteria of the sulphur cycle
3. Ecology of the bacteria of the sulphur cycle with special reference to anoxic—oxic interface environments
4. F. Widdel, Anaerober Abbau von Fettsäuren und Benzoesäure durch neu isolierte Arten sulfat-reduzierender Bakterien, Doctoral Thesis, Univ. Göttingen, 1980, 443 pp.
5. The Prokaryotes;Pfennig,1981