@book { ImmermannJahrbuch22001,
    title = "Immermann-Jahrbuch 2/2001",
    author = "Peter {Hasubek} and Gert {Vonhoff}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1091792"
}