{"id":"001530668","type":"article","title":"River frontiers of fortified corridors?","publisher":"Archaeopress Publishing Ltd.","publisher-place":"Oxford","pages":"186-193","container-title":"Roman frontier studies 2009: proceedings of the XXI International Congress of Roman Frontier Studies (Limes Congress) held at Newcastle-upon-Tyne in August 2009","author":[{"family":"Graafstal","given":"Erik"}],"issued":{"raw":"2017"}}