@book { DieGeruchsmarkealsGemeinschaftsmarke,
    title = "Die Geruchsmarke als Gemeinschaftsmarke",
    author = "Cathrin {Isenberg}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1135681"
}