@book { DerErwerbeigenerAktieninDeutschland,
    title = "Der Erwerb eigener Aktien in Deutschland",
    author = "Markus {Pertlwieser}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1101146"
}