@book {9783534406500, title = "Thüringen östlich der Saale im Mittelalter", isbn = "9783534406500", url = "http://www.content-select.com/index.php?id=bib_view&ean=9783534406500", url = "https://content-select.com/de/portal/media/view/630f3688-9f04-4276-a148-642d8677ec64", publisher = "WBG", }