@book { KnowledgeEcoSystems,
    title = "Knowledge EcoSystems",
    author = "Denis {Bauer}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832444303",
    url = "https://m.diplom.de/document/220037"
}