@book { DerWiderrufvonLastschrifteninderInsolvenznatrlicherPersonen,
    title = "Der Widerruf von Lastschriften in der Insolvenz natürlicher Personen",
    author = "Petra {Fischer}",
    year = "2011",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-00377-2",
    url = "https://www.peterlang.com/document/1054234"
}