Ibn al-Ṣalāḥ, Aḥmad ibn Muḥammad, -1153 or 1154. On the fourth figure of the categorical syllogism.

Galen and the syllogism : an examination of the thesis that Galen originated the fourth figure of the syllogism in the light of new data from Arabic sources, including an Arabic text edition and annotated translation of Ibn al-Salāh's treatise On the fourth figure of the categorical syllogism / [Nicholas Rescher].