@book { DieGeldKarte,
    title = "Die GeldKarte",
    subtitle = "Ein neues Instrument des bargeldlosen Zahlungsverkehrs",
    author = "Ingo-Jens {Tegebauer}",
    year = "2002",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093841"
}