Hipp, A., Fritsch, M.
, Greve, M., Günther, J., Lange, M., Liutik, C., Pfeifer, B., Shkolnykova, M., & Wyrwich, M. (2022).
Comprehensive Patent Data of the German Democratic Republic 1949–1990.
Jahrbucher fur Nationalokonomie und Statistik.
https://doi.org/10.1515/jbnst-2022-0058