@book { DiewertpapierfreieAktie,
    title = "Die «wertpapierfreie» Aktie",
    author = "Alexandra {Isaakidis}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1103051"
}