@book { IndustriekonomischeAnalysedesdeutschenLuftfrachtmarktes,
    title = "Industrieökonomische Analyse des deutschen Luftfrachtmarktes",
    author = "Jens {Erkes}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836615402",
    url = "https://m.diplom.de/document/225918"
}