@book { MehrsprachigkeitundihreRahmenbedingungen,
    title = "Mehrsprachigkeit und ihre Rahmenbedingungen",
    author = "Demeter Michael {Ikonomu}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1104379"
}