@book { InHouseBanking,
    title = "In-House-Banking",
    author = "Beate {Foerstner}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832438210",
    url = "https://m.diplom.de/document/219498"
}