@book { DievirtuelleStadt,
    title = "Die virtuelle Stadt",
    author = "Joachim {Stenneken}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832420208",
    url = "https://m.diplom.de/document/217454"
}