{"id":"000857210","type":"article","title":"The Christian frontier against al-Ándalus (Muslim Spain)","publisher":"LIT Verlag","publisher-place":"Münster","pages":"67-84","container-title":"Walls, ramparts, and lines of demarcation : selected studies from antiquity to modern times","author":[{"family":"Corral","given":"Fernando Luis"}],"issued":{"raw":"2009"}}