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Production and utilization of biogas in rural areas of industrialized and developing countries / [comp. and prep. by Gerhard Eggeling, Götz Mackensen, Ludwig Sasse ; rev. and updated by Jens Hohlfeld, Christoph Zimmermann ; transl. by James and Gisela Lorenz].
- Deutsche Gesellschaft für technische Zusammenarbeit (GTZ),
- 1985.
- Eschborn :
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Accounting for emissions : a new emissions-calculating tool tested in six energy-related projects / [Christoph Menke, Butch Gadde].
- Deutsche Gesellschaft für technische Zusammenarbeit (GTZ). Climate protection programme,
- 2009.
- Eschborn :