1. Broberg, G.: Oxygen’s significance for the ruminal flora as illustrated by measuring the redox potential in rumen contents. Nord. Vet- Med. 1957, 9, 57–60.
2. Gregory, E. M. & I. Fridovich: Oxygen metabolism in Lactobacillus plantarum. J. Bact. 1974, 117, 166–169.
3. Hobson, P. N.: The Microflora of the Rumen. Meadowfield Press Ltd., Durham 1976.
4. Hungate, R. E.: Microorganisms in the rumen of cattle fed a constant ration. Canad. J. Microbiol. 1957, 3, 289–311.
5. Jacob, H. E.: Redox potential. In Methods in Microbiology 2, 91–123. Ed. by J. R. Norris & D. IV. Ribbons. Acad. Press, London 1970.