@book { DerverhalteneGangindiedeutscheEinheit,
    title = "Der verhaltene Gang in die deutsche Einheit",
    author = "Markus {Trömmer}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093827"
}