@book { DasRingenumdieRuhedesNordens,
    title = "Das Ringen um die Ruhe des Nordens",
    author = "Jörg Philipp {Lengeler}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1086405"
}