@book { KarlRPopperBibliographie19252004,
    title = "Karl R. Popper Bibliographie 1925-2004",
    author = "Manfred {Lube}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1099320"
}