1. Iranpour R, Oh S, Kim H, Shao YJ, Hagekhalil A, Schafer P, Stenstrom MK, Ahring BK (2002) Wat Environ Federation in press
2. Zinder SH (1993) Physiological ecology of methanogens. In: Ferry JG (ed), Methanogenesis. Ecology, physiology, biochemistry & genetics. Chapman & Hall, New York, p 128
3. Schink B(1992) Syntrophism among prokaryotes. In: Balows A, Trüper HG, Dworkin M, Harder W, Schleifer K-H (eds), The prokaryotes. Springer Verlag, Berlin Heidelberg New York p 276
4. Mackie RI, Bryant MP (1981) Appl Environ Microbiol 41:1363
5. Thiele JH, Zeikus JG (1988) Interactions between hydrogen-and formate-producing bacteria and methanogens during anaerobic digestion. In: Erickson LE, Fung DY (eds), Handbook on anaerobic fermentation. Marcel Dekker, New York, p 537