@book { DerModellversuchKoLA,
    title = "Der Modellversuch KoLA",
    author = "Klaus {Breuer} and Rüdiger {Tauschek} and Helmut {Becker} and Wolfgang {Ettmüller}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1106665"
}