{"id":"001241474","type":"book","title":"Die Ruine der Ruine auf der Ruine. Burg Ringelstein in Büren-Harth - ein Zwischenbericht","pages":"75-86","container-title":"Burgen und Schlösser, 52,2 (2011","author":[{"family":"Leenen","given":"Stefan."}],"issued":{"raw":"2011"}}