@book { SpenglereinDenkerderZeitenwende,
    title = "Spengler – ein Denker der Zeitenwende",
    author = "Manfred {Gangl} and Gilbert {Merlio} and Markus {Ophälders}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1107242"
}