1. Ahring, B.K., 1992. Turn-over of acetate in hot springs at 70°C. In: Proceedings of Thermophilies: Science and Technology, Reykjavik-Iceland. 130.
2. Ahring, B.K., 1994. Status on science and application of thermophilic anaerobic digestion. In: Seventh International Symposium on Anaerobic Digestion, Cape Town-South Africa. 328–337.
3. Volatile fatty acids as indicators of process imbalance in anaerobic digestors;Ahring;Appl. Microbiol. Biotechnol.,1995
4. APHA-American Public Health, Association. American Water Works Association, Water Environmental Federation, 1989. Standard Methods for the examination of Water and Wastewater. 17th ed. Washington, DC.
5. Methanogenic population dynamic during starup of a full scale anaerobic sequencing batch reactor treating swine waste;Angenent;Water Res.,2002