C. Klessmann, M. Rathmann, D. de Jager, A. Gazzo, G Resch, S Busch, M. Ragwitz:
"Policy options for reducing the costs of reaching the European renewables target";
Renewable Energy, 57 (2013), S. 390 - 403.
http://dx.doi.org/10.1016/j.renene.2013.01.041