@book { BalancedScorecardalsControllinginstrumenteinesStartups,
    title = "Balanced Scorecard als Controllinginstrument eines Start-ups",
    author = "Alexander {Braun}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832432393",
    url = "https://m.diplom.de/document/218927"
}