{"id":"001024708","type":"book","title":"Why did the Roman empire cease to expand?","publisher":"Archaeopress","publisher-place":"Oxford","pages":"25-34","container-title":"Limes 18 : Proceedings of the 18th International Congress of Roman Frontier Studies held in Amman, Jordan (September 2000","author":[{"family":"Hanson","given":"W. S."}],"issued":{"raw":"2002"}}