@book { SchriftlicheFormulierungsproblemeinderSekundarstufeII,
    title = "Schriftliche Formulierungsprobleme in der Sekundarstufe II",
    author = "Wolfgang {Loch}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1135395"
}