@book { RobertSchumannunddiegroeForm,
    title = "Robert Schumann und die große Form",
    author = "Bernd {Sponheuer} and Wolfram {Steinbeck}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1106525"
}