@book { SchrankehinterdenSchranken,
    title = "Schranke hinter den Schranken",
    author = "Fabian {Ibel}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b14899",
    url = "https://www.peterlang.com/document/1057437"
}