@book { DiskretePrsenz,
    title = "Diskrete Präsenz",
    author = "Maria {Trappen}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    doi = "10.3726/978-3-0351-0460-8",
    url = "https://www.peterlang.com/document/1052874"
}