@book { BeteiligungscontrollingindeutschenUnternehmen,
    title = "Beteiligungscontrolling in deutschen Unternehmen",
    author = "Stephan {Maier}",
    year = "2001",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1091613"
}