@book { Descartes,
    title = "Descartes",
    subtitle = "Herausgegeben von Thomas Keutner",
    author = "Thomas {Keutner}",
    year = "1993",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1079127"
}