1. Sterner M., 2009. Bioenergy and renewable power methane in integrated 100% renewable energy systems, PhD thesis, Faculty of Electrical Engineering and Computer Science, University of Kassel.
2. Specht M., Baumgart F., Feigl B., Frick V., Stürmer B., Zuberbühler U., Sterner M., Waldstein G., 2009. Storing bioenergy and renewable electricity in the natural gas grid, Renewable Energy Research Association, annual meeting 2009, Berlin, November 24-25.
3. Nitsch J. et al., 2012. Langfristszenarien und Strategien für den Ausbau der erneuerbaren Energien in Deutschland bei Berücksichtigung der Entwicklung in Europa und global, study performed by DLR, Fraunhofer IWES and IFNE on behalf of BMU, Berlin.
4. Breyer Ch., Rieke S., Sterner M., Schmid J., 2011. Hybrid PV-Wind-Renewable Power Methane Plants – An Economic Outlook, 6th International Renewable Energy Storage Conference (IRES), Berlin, November 28-30.
5. Palzer A. and Henning H.-M., 2014. A comprehensive model for the German electricity and heat sector in a future energy system with a dominant contribution from renewable energy technologies – Part II: Results, Renewable and Sustainable Energy Reviews, 30, 1019-1034.