1. Shelton, D. R. and Tiedje, J. M. (1984),Appl. Environ. Microbiol. 47, 850–857.
2. Berry, D. F., Francis, A. J., and Bollag, J. M. (1987),Microbiol. Rev. 51,43–59.
3. Holliger, C., Stams, A.J.M., and Zehnder A.J. B. (1988),Fifth International Symposium on Anaerobic Digestion, Bologna, Italy, Hall, E. R. and Hobson, P. N., eds., Academic, pp. 211–223.
4. Dolfing, J. and Tiedje, J. M. (1988),Fifth International Symposium on Anaerobic Digestion, Bologna, Italy, Tilche, A. and Rozzi, A., eds., Monduzzi Editore S.P.A., pp. 839-842.
5. Borghans, A. J. M. and Van Driel A. (1988),Fifth International Symposium on Anaerobic Digestion, Bologna, Italy, Tilche, A. and Rozzi, A., eds., Monduzzi Editore S.P.A., pp. 627–631.