@book { DieBriefwahl,
    title = "Die Briefwahl",
    subtitle = "Entwicklung und Verfassungsmäßigkeit der Briefwahl in Deutschland",
    author = "Ole {Fichtner}",
    year = "2026",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1688221"
}