@book { FlottenpolitikvonLuftverkehrsgesellschaften,
    title = "Flottenpolitik von Luftverkehrsgesellschaften",
    author = "Tobias {Poss}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832474775",
    url = "https://m.diplom.de/document/222743"
}