@book { WissensmanagementinmittelstndischenUnternehmen,
    title = "Wissensmanagement in mittelständischen Unternehmen",
    author = "Gregor {Krey}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832427108",
    url = "https://m.diplom.de/document/218452"
}