@book { SchwarzeSchmetterlingeEinFallfrMariaWernBand4,
    title = "Schwarze Schmetterlinge: Ein Fall für Maria Wern - Band 4",
    author = "Anna {Jansson} and Susanne {Dahmann}",
    year = "2018",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://m.dotbooks.de/document/452029"
}