@book { DieGmbHCoKGalsEuropaHolding,
    title = "Die GmbH & Co. KG als Europa-Holding",
    author = "Michael A. {Müller}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1098306"
}