* General information [http://www5.gtz.de/gate/ http://www5.gtz.de/gate/]
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* Kossmann, W., Pönitz, U., Habermehl, S., Hoerz, T., Krämer, P., Klingler, B., Kellner, C., Wittur, T., von Klopotek, F., Krieg, A. and Euler H. (1999). Biogas Digest Volume II – Application and Product Development. GTZ, Eschborn, DE.
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===Acknowledgements===
{{:Acknowledgements Sanitation}}
