1. Andrews, J. F.: Biotechnol. Bioeng. Symp. 2, 5–33 (1971)
2. Anonym: Deutsche Einheitsverfahren zur Wasser-, Abwasser- und Schlamm-Untersuchung. Loseblattsammlung. Weinheim, New York: Chemie 1960–1975
3. Anonymous: Report of the preparatory mission on biogas technology and utilization. (RAS/74/041/A/01/01) (1975)
4. Arima, K. (ed.): Microbiology for environment cleaning. Support Minist. Educ. 212204–1977 (1978)
5. Arima, K., Shoun, H., Yamashita, I., Anazawa, H., Beppu, T.: In: Microbiology for environment cleaning. Arima, K. (ed.), pp. 104–119. Support Minist. Educ. 212204–1977 (1978)