@book { AbsentismusMglichkeitenzurReduzierung,
    title = "Absentismus, Möglichkeiten zur Reduzierung",
    author = "Carsten {Müller}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832464097",
    url = "https://m.diplom.de/document/221836"
}