@book { DieKndigungordentlichunkndbarerArbeitnehmer,
    title = "Die Kündigung ordentlich unkündbarer Arbeitnehmer",
    author = "Marion {Gusek}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1099248"
}