@book { DidaktischeTransformationundKonstruktion,
    title = "Didaktische Transformation und Konstruktion",
    author = "Adelheid {Schumann} and Lieselotte {Steinbrügge}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1103649"
}