@book { ErzwungeneSelbstndigkeitvonArbeitnehmernOutsourcing,
    title = "Erzwungene Selbständigkeit von Arbeitnehmern – Outsourcing",
    author = "Bernd {Hesse}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1091940"
}