@book { SexsellsErotischeInhalteinOnlineDiensten,
    title = "Sex sells - Erotische Inhalte in Online-Diensten",
    author = "Dirk {Lehmanski}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832432614",
    url = "https://m.diplom.de/document/218948"
}