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2. Federal Ministry for Economic Affairs and Energy (BMWi), Making a success of the energy transition, 2015.
3. Federal Ministry for Economic Affairs and Energy (BMWi), The energy transition: key projects of the 18th legislative term. 10-point energy agenda of the Federal Ministry for Economic Affairs and Energy, 2014.
4. Federal Ministry of Economics and Technology (BMWi), Federal Ministry for the Environment; Nature Conversation and Nuclear Safety (BMU), Energy Concept for an Environmentally Sound, Reliable and Affordable Energy Supply, 2010.
5. R. Kollmorgen, W. Merkel, H.-J. Wagener, Transformation und Transformationsforschung: Zur Einführung, in: R. Kollmorgen, W. Merkel, H.-J. Wagener (Eds.) Handbuch Transformationsforschung, Springer, Wiesbaden, 2015, pp. 11-30 (book in German).