@book { ValidittssteigerungendurchadaptivesTesten,
    title = "Validitätssteigerungen durch adaptives Testen",
    author = "Andreas {Frey}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1100208"
}