https://www.e-fi.de/fileadmin/Gutachten_2011/EFI_Report_2011.pdf (Verlagsversion)
https://www.e-fi.de/fileadmin/Gutachten_2011/EFI_Gutachten_2011.pdf (Verlagsversion)
Achleitner, A.-C., Allmendinger, J., Gerybadze, A., Harhoff, D., Llerena, P., & Luther, J. (2011). Report - Research, Innovation and Technological Performance in Germany. Berlin: EFI.