@book { GrenzeneinseitigerDienstfreistellung,
    title = "Grenzen einseitiger Dienstfreistellung",
    author = "Elke {Standeker}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832405175",
    url = "https://m.diplom.de/document/216451"
}