@book { SngerliebeSngerkrieg,
    title = "Sängerliebe – Sängerkrieg",
    author = "Nikolas {Immer} and Cordula {Kropik}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b15869",
    url = "https://www.peterlang.com/document/1056009"
}