{"id":"001021458","type":"book","title":"The Frisian achievement in the first millennium AD","publisher":"Oxford University Committee for Archaeology","publisher-place":"Oxford","pages":"11-16","container-title":"The making of kingdoms. Papers from the 47th Sachsensymposium York, September 1996","author":[{"family":"Heidinga","given":"Anthonie"}],"issued":{"raw":"1999"}}