@book { ProductPlacementimdigitalenFernsehen,
    title = "Product Placement im digitalen Fernsehen",
    author = "Patric {Velten}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832432553",
    url = "https://m.diplom.de/document/218942"
}