[31] Maçoudi, Le livre de l'avertissement et de la révision. Translation by B. Carra de Vaux, Paris, 1896.
[32] Verifying the hypothesis of Woepcke, Propagation, that the Sindhind included a treatment of arithmetic.
[33] Aḥmed ibn ‛Abdallāh, Suter, Die Mathematiker, etc., p. 12.
[34] India, Vol. II, p. 15.
[35] See H. Suter, "Das Mathematiker-Verzeichniss im Fihrist," Abhandlungen zur Geschichte der Mathematik, Vol. VI, Leipzig, 1892. For further references to early Arabic writers the reader is referred to H. Suter, Die Mathematiker und Astronomen der Araber und ihre Werke. Also "Nachträge und Berichtigungen" to the same (Abhandlungen, Vol. XIV, 1902, pp. 155-186).
[36] Suter, loc. cit., note 165, pp. 62-63.
[37] "Send Ben Ali,... tùm arithmetica scripta maximè celebrata, quae publici juris fecit." [Loc. cit., p. 440.]
[38] Scritti di Leonardo Pisano, Vol. I, Liber Abbaci (1857); Vol. II, Scritti (1862); published by Baldassarre Boncompagni, Rome. Also Tre Scritti Inediti, and Intorno ad Opere di Leonardo Pisano, Rome, 1854.
[39] "Ubi ex mirabili magisterio in arte per novem figuras indorum introductus" etc. In another place, as a heading to a separate division, he writes, "De cognitione novem figurarum yndorum" etc. "Novem figure indorum he sunt 9 8 7 6 5 4 3 2 1."
[40] See An Ancient English Algorism, by David Eugene Smith, in Festschrift Moritz Cantor, Leipzig, 1909. See also Victor Mortet, "Le plus ancien traité francais d'algorisme," Bibliotheca Mathematica, Vol. IX (3), pp. 55-64.