@book { WebUML,
    title = "WebUML",
    subtitle = "UML zur Modellierung von DataWeb Applikationen",
    author = "Werner {Hartmann}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832432539",
    url = "https://m.diplom.de/document/218941"
}