{"id":"001599643","type":"article","title":"An unusual Umayyad overstrike and its implications","publisher":"Schweizerischen Numismatischen Gesellschaft","publisher-place":"Bern","pages":"90-92","container-title":"Schweizer Münzblätter, 68 (2018","author":[{"family":"Walker","given":"Alan"}],"issued":{"raw":"2018"}}