Jean Druel and Almog Kasher, “‘Though this be madness, yet there is method in’t’: The mamnūʿ min al-ṣarf (diptotes) in Arabic grammatical tradition” in Arabica 66 (2019), pages 98‒136.

Jean Druel, “Can Ambrosiana X 56 Sup. improve our understanding of Sībawayhi’s grammar?” in Manuela E. B. Giolfo and Kees Versteegh (editors), The Foundations of Arabic Linguistics IV,  Brill: Leiden, Boston, 2019, pages 133‒156.