@book { Dasffnungszeitengesetz,
    title = "Das Öffnungszeitengesetz",
    author = "Doris {Schättle}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832451479",
    url = "https://m.diplom.de/document/220674"
}