@book { BreakEvenAnalyseimUnternehmenscontrolling,
    title = "Break-Even-Analyse im Unternehmenscontrolling",
    author = "Daniel {Schmitz}",
    year = "2011",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842819177",
    url = "https://m.diplom.de/document/228563"
}