@book { GrenzenfunktionalerIntegration,
    title = "Grenzen funktionaler Integration",
    author = "Katharina {Schermuly}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-02202-5",
    url = "https://www.peterlang.com/document/1047358"
}