1. Directive 2008/98/EC of the European Parliament and of the Council on waste and repealing certain directives, 19.11.2008, L312/3-30, Off. J. Eur. Union, Strasbourg, published 22.11.2008.
2. Statistisches Bundesamt,2017
3. “Global assessment of municipal organic waste production and recycling”;Ricci-Jürgensen;ISWA World Congress,2019
4. Ordinance for the Utilization of Organic Waste on Agricultural, Forestrily and Horticulturally Used Soils;BioAbfV,2017
5. “Biogasgülle am besten unterpflügen” in Flur und Furche, vol. 184, p. 19 (2005) und “Biogas: Gülle unterpflügen”;Krüger;dlz-Agrarmagazin,2005