@book { Thesaleofnonperformingloansbeneficialforabank,
    title = "The sale of non-performing loans - beneficial for a bank?",
    author = "Dirk {Grötzinger}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832492724",
    url = "https://m.diplom.de/document/224394"
}