@book { SpenglerohneEnde,
    title = "Spengler ohne Ende",
    author = "Gilbert {Merlio} and Daniel {Meyer}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-04114-9",
    url = "https://www.peterlang.com/document/1048281"
}