@book { ExtendedRelationshipManagementimBankensektor,
    title = "Extended Relationship Management im Bankensektor",
    author = "Christoph {Radon}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832456047",
    url = "https://m.diplom.de/document/221087"
}