Marcinkowski, M.I. 2001. Rapprochement and Fealty during the Būyids and Early Saljūqs: The Life and Times of Muḥammad ibn al-Ḥasan al-Ṭūsī . Islamic Studies. 40, 2 (Jun. 2001), 273-296. DOI:https://doi.org/10.52541/isiri.v40i2.5292.