@book { ImmermannJahrbuch102009,
    title = "Immermann-Jahrbuch 10/2009",
    author = "Peter {Hasubek} and Gert {Vonhoff}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1107116"
}