@book { WegderTheorieHodosTheorias,
    title = "Weg der Theorie – Hodos Theorias",
    author = "Evelin {Klein}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1135719"
}