@book { VirtuelleMarktpltzeimInternet,
    title = "Virtuelle Marktplätze im Internet",
    author = "Fabian {Weiß}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832443436",
    url = "https://m.diplom.de/document/219955"
}