@book { VisionenundIllusionen,
    title = "Visionen und Illusionen",
    author = "Magnus P. {Ängsal} and Frank Thomas {Grub}",
    year = "2015",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-04900-8",
    url = "https://www.peterlang.com/document/1067592"
}