@book { BlauerHimmelberderBundesrepublik, title = "Blauer Himmel über der Bundesrepublik", author = "Jan {Schulte Südhoff}", year = "2007", publisher = "Diplom.de", address = "Hamburg, Deutschland", doi = "10.3239/9783836604314", url = "https://m.diplom.de/document/228944" }