@book { LehrenLernenPrfen,
    title = "Lehren – Lernen – Prüfen",
    author = "István {Bábosik} and Richard {Olechowski}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095051"
}