 Khûnajî's Disclosure inspired work by other great Eastern logicians not mentioned by Ibn Khaldûn, namely, Athîraddîn al-Abharî (d. 1265) and Najmaddîn al-Kâtibî (d. 1276). Bar Hebraeus claims that Abharî was also one of Râzî's students, though as in the case with Khûnajî, opportunity for direct contact must have been virtually non-existent.  Kâtibî was Abharî's student. So too, perhaps, was the great Shî‘î scholar Nasiraddîn at-Tûsî (d. 1274); at any rate, he had read Râzî's commentary on Avicenna's Pointers under Abharî (Endress 2006: 411). These three men are among the greatest logicians working anywhere in the thirteenth century. Two of them, Kâtibî and Abharî, produced the two texts which became mainstays of the madrasa teaching of logic, studied from the late thirteenth century down to the present day: the Îsâghûjî and the Shamsiyya (see Calverley 1933 and Kâtibî 1948).