@book { StrategischeMarketingoptioneninreguliertenMrkten,
    title = "Strategische Marketingoptionen in regulierten Märkten",
    author = "Anna-Katharina {Koenen}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b16259",
    url = "https://www.peterlang.com/document/1057642"
}