{"id":"001001780","type":"book","title":"Die Duisburger Stadtbefestigung von ihren Anfängen bis heute","publisher":"Böhlau","publisher-place":"Köln/Weimar/Wien","pages":"249-261","container-title":"Die Befestigung der mittelalterlichen Stadt","author":[{"family":"Krause","given":"Günter"}],"issued":{"raw":"1997"}}