@book { DerumkmpfteOrtvonderAntikezumMittelalter,
    title = "Der umkämpfte Ort – von der Antike zum Mittelalter",
    author = "Olaf {Wagener}",
    year = "2009",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1105099"
}