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Knobel، E. B. (يونيو 1895). "Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket". Monthly Notices of the Royal Astronomical Society. ج. 55: 429–438. Bibcode:1895MNRAS..55..429K. DOI:10.1093/mnras/55.8.429.