Klagge, B., Schmole, H., Seidl, I., & Schön, S. (2016). Future of German energy co-operatives: Challenges and opportunities in an innovation perspective. Raumforschung Und Raumordnung | Spatial Research and Planning, 74(3), 243–258. https://doi.org/10.1007/s13147-016-0398-3