@book { DiePrivatisierungvonPersonenbahnhfen,
    title = "Die Privatisierung von Personenbahnhöfen",
    author = "Bernd {Metzler}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1088589"
}