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|   | *[[History of Biogas|History of Biogas]]    |   | *[[History of Biogas|History of Biogas]]    | 
|   | *[[Appearance of Different Types of Biogas Plants|Appearance of Different Plant Types]]    |   | *[[Appearance of Different Types of Biogas Plants|Appearance of Different Plant Types]]    | 
| − | *[[Microbiological Methanation|Microbiological Methanation]]    | + | *[[Microbiological Methanation|Microbiological Methanation]][[Parameters and Process Optimisation for Biogas|<br>]]    | 
| − | *[[Parameters and Process Optimisation for Biogas|Parameters and Process Optimisation]]  
  | + |  | 
|   | *[[Utilization of Biogas|Utilization]]  |   | *[[Utilization of Biogas|Utilization]]  | 
|   |  |   |  | 
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|   | *<font color="#002bb8">[[CDM|Carbon Finance (CDM, Voluntary Market)]]</font><br>  |   | *<font color="#002bb8">[[CDM|Carbon Finance (CDM, Voluntary Market)]]</font><br>  | 
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| − |    | + | <br>  | 
|   | </span>    |   | </span>    | 
|   |  |   |  | 
|   | + |  | 
|   | + | <br>   | 
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|   | |}  |   | |}  |