{"id":"000996524","type":"book","title":"Fields and field systems in Scandinavia during the middle ages","publisher":"Brill","publisher-place":"Leiden/New York/Köln","pages":"173-192","container-title":"Medieval farming and technology : The impact of agricultural change in Northwest Europe","author":[{"family":"Widgren","given":"Mats."}],"issued":{"raw":"1997"}}