@book { FortentwicklungdesBetriebsstttenprinzips,
    title = "Fortentwicklung des Betriebsstättenprinzips",
    author = "Markus {Peter}",
    year = "2002",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093855"
}