@book { DevelopmentandimplementationofaServiceAccessConcept,
    title = "Development and implementation of a Service Access Concept",
    author = "Michael {Fischer}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832444839",
    url = "https://m.diplom.de/document/220085"
}