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  1. Ibn Y?nus' very useful tables for reckoning time by the sun.David A. King - 1973 - Archive for History of Exact Sciences 10 (3-5):342-394.
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  • A Medieval Interpolation Scheme for Oblique Ascensions.Javad Hamadanizadeh - 1964 - Centaurus 9 (4):257-265.
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  • Arabic numeral forms.Rida A. K. Irani - 1955 - Centaurus 4 (1):1-12.
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