@book { WissensmanagementImplementierunginTheorieundPraxis,
    title = "Wissensmanagement-Implementierung in Theorie und Praxis",
    author = "Markus {Ertl}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832444433",
    url = "https://m.diplom.de/document/220050"
}