@book{ 0-895054299, title = {Database of the Letters of Pope Gregory VII: (1073-1085); which letter is in which collection?; G7LDB - Gregory 7th Letter Database}, author = {Gregor and Schwaderer, Christian}, editor = {Gregor VII. Papst}, editor = {Schwaderer, Christian}, address = {Tübingen}, publisher = {Seminar für mittelalterliche Geschichte}, year = {2014}, language = {English}, language = {Latin}, url = {http://www.bibliothek.uni-regensburg.de/dbinfo/frontdoor.php?titel_id=100407}, url = {http://dx.doi.org/10.15496/publikation-39290}, url = {https://katalog.hgb-leipzig.de/Record/0-895054299} }