@book { PrferenzenProblemePotentialeDasKonsumverhaltenltererMenschen,
    title = "Präferenzen, Probleme, Potentiale - Das Konsumverhalten älterer Menschen",
    author = "Robert {Krakau}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832414269",
    url = "https://m.diplom.de/document/217284"
}