https://www.e-fi.de/fileadmin/Gutachten_2008/EFI_Report_2008.pdf (Publisher version)
https://www.e-fi.de/fileadmin/Gutachten_2008/EFI_Gutachten_2008.pdf (Publisher version)
Harhoff, D., Grupp, H., Achleitner, A.-C., Allmendinger, J., & Luther, J. (2008). Report - Research, Innovation and Technological Performance in Germany. Berlin: EFI.