@book { PrivateRenteaberwie,
    title = "Private Rente - aber wie?",
    author = "Matthias {Basile}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836604239",
    url = "https://m.diplom.de/document/228937"
}