@book { RechtaufLebensmittelkennzeichnung,
    title = "Recht auf Lebensmittelkennzeichnung?",
    author = "Matthias {von Oppen}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095168"
}