@book { VariationWandelWissen,
    title = "Variation, Wandel, Wissen",
    author = "Yvonne {Hettler} and Carolin {Jürgens} and Robert {Langhanke} and Christoph {Purschke}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03565-0",
    url = "https://www.peterlang.com/document/1046910"
}