Interesting links
| Viessmann |
| BIOFerm Energy Systems (USA) |
| Schmack Biogas GmbH: Comprehensive biogas range |
| Schmack Biogas S.r.l. (Italy) |
| Schmack Carbotech GmbH: Gas treatment |
| German Biogas Association |
| German agency for renewables |
| German agency for renewable energy |
| International Renewable Energy Agency |
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