@book { StiftungenSteuersparmodellfrdiePraxis,
    title = "Stiftungen - Steuersparmodell für die Praxis?",
    author = "Mario {Hengst}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/225121"
}