@book { DieDuplicata,
    title = "Die Duplicata",
    subtitle = "Ein Wertpapier des brasilianischen Handels",
    author = " {Anonym}",
    year = "1986",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1074348"
}