| Seeing Islam as others saw it: a survey and evaluation of Christian, Jewish, Robert G | |
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| "Muhmmad," Encyclopedia of Islam and the Muslim world• Lapidus 2002 , pp 0 | 5, "One major challenge to examining initial contacts between Byzantium and the early Muslim umma arises from the controversy surrounding the traditional Islamic account | 
| Peter Teed 1992 , p | 
however, there is no relevant archaeological, epigraphic, or numismatic evidence dating from the time of Muhammad, nor are there any references to him in non-Muslim sources dating from the period before 632.
4| 137 Netanel's work was virtually unknown beyond his native Yemen until modern times, so had little influence on later Jewish thought• Hitti, History of the Arabs, 10th edition 1970 , p | See, for example, Bowersock, Glen Warren, Peter Robert Lamont Brown and Oleg Grabar Late Antiquity: A Guide to the Postclassical World 1999, Harvard University Press p | 
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| Ideally, one would like to be able to check such accounts against contemporary evidence |