@book { DieNebenleistungspflichtenbeiderGmbH,
    title = "Die Nebenleistungspflichten bei der GmbH",
    author = "Raimund {Janke}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1116414"
}