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Books about Sayfi:
Sayf-i Sarayi's Gulistan Bi't Turki (Uralic & Altaic) by A. Bodrogligeti (Jul 29, 1997)
Acta Orientalia (Academiae Scientiarum Hungaricae, articles in French, German, and English: "Old Tibetan Drama... by G. Uray and others A. Bodrogligeti (1962)
Wiki information Sayfi:
Abdulrab Muhammad Muhammad Ali al-Sayfi a Yemeni, became wanted in 2002, by the United States Department of Justice's FBI, which was then seeking information about his identity and whereabouts. In early 2002, he had been named in a suspected Yemen...