@book { RechtsundSicherheitsfragenbeionlineinsuring,
    title = "Rechts- und Sicherheitsfragen bei online-insuring",
    author = "Matthias {Heck}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832414078",
    url = "https://m.diplom.de/document/217266"
}