@book { MegatrendGesundheitstourismus,
    title = "Megatrend Gesundheitstourismus",
    subtitle = "Abgrenzung und Entwicklung",
    author = "Jürgen {Schwaiger}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832498139",
    url = "https://m.diplom.de/document/224930"
}