@book { Lorenzkurvendisparitt,
    title = "Lorenzkurvendisparität",
    subtitle = "Neuere Entwicklungen, Erweiterungen und Anwendungen",
    author = "Frauke {Wolf}",
    year = "1997",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b13990",
    url = "https://www.peterlang.com/document/1068529"
}