@book { VirtuelleAktienoptionsprogrammebrsennotierterAktiengesellschaften,
    title = "Virtuelle Aktienoptionsprogramme börsennotierter Aktiengesellschaften",
    author = "Johannes {Janning}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b16556",
    url = "https://www.peterlang.com/document/1058582"
}