@book{ 0-1074366638, title = {Forschungen zur politischen Ideenwelt des Frühmittelalters}, author = {Erdmann, Carl and Baethgen, Friedrich}, editor = {Baethgen, Friedrich}, address = {Berlin}, publisher = {Akademie-Verlag}, year = {1951}, language = {German}, url = {https://katalog.hgb-leipzig.de/Record/0-1074366638} }