@book { vmbringtmitstarckenturnenmurn,
    title = "«vmbringt mit starcken turnen, murn»",
    subtitle = "Ortsbefestigungen im Mittelalter",
    author = "Olaf {Wagener}",
    year = "2011",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1107668"
}