@book{ 0-1428324933, title = {Regesta imperii}, author = {Schmidt, Ulrich}, editor = {Schmidt, Ulrich}, address = {Köln}, publisher = {Böhlau}, year = {2012}, isbn = {9783412208561}, isbn = {3412208566}, language = {German}, url = {https://katalog.ub.uni-leipzig.de/Record/0-1428324933} }