{"id":"001504720","type":"article","title":"A Viking Age Landscape of Defence in the Low Countries? The ringwalburgen in the Dutch Province of Zeeland","publisher":"Brepols","publisher-place":"Turnhout","pages":"223-261","container-title":"Landscapes of defence in early medieval Europe","author":[{"family":"Harkel","given":"Letty Ten"}],"issued":{"raw":"2013"}}