1. agriKomp GmbH, 2010. Quetschprofi – the separator for liquid manure and digestate. Available from: http://www.biogastechnik.de/.
2. Global Trade and Environmental Impact Study of the EU Biofuels Mandate;Al-Riffai,2010
3. Emissions of NH3, N2O and CH4 after application of cattle manure and influences of treatment;Amon;Emissionen der Tierhaltung, KTBL-Schrift,2002
4. Optimisation of Procurement and Distribution Logistics for Large-scale Biogas Plants;Amon,2007
5. The Integrated Energy and Climate Programme of the German Government;BMU,2007