@book { DasPotsdamerAbkommen19452015,
    title = "Das Potsdamer Abkommen 1945–2015",
    author = "Christoph {Koch}",
    year = "2017",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b10949",
    url = "https://www.peterlang.com/document/1050013"
}