Biogas: produce locally, profit regionally, win internationally 18th Annual Conference of German Biogas Association with comprehensive biogas exhibition ; February 3rd to February 5th 2009, Exhibition Center Hanover (Fachverband Biogas e.V., 2009)
Dt. Ausg. u.d.T.: Biogas: dezentral erzeugen, regional profitieren, international gewinnen