@book{ title = "Briefwechsel", author = "Wagner, Richard,Ludwig,Wölfel, Kurt", year = "1993", publisher = "Hatje", address = "Stuttgart", language = "ger", isbn = "3775704140", keywords = "Briefsammlung,Wagner, Richard <1813-1883>,Ludwig ,Correspondence,Wagner, Richard,Ludwig", series = "Korrespondenzen, 1", content = "Verlag", "Inhaltsverzeichnis", }