@book { LocatingEfficiencyandProductivityChampionsinanewBankingEnvironment,
    title = "Locating Efficiency and Productivity Champions in a new Banking Environment",
    author = "Georg-Stephan {Barfuß}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832417918",
    url = "https://m.diplom.de/document/217648"
}