Affirming the Imamate early Fatimid teachings in the Islamic west : an Arabic critical edition and English translation of works attributed to Abū 'Abd Allāh al-Shī'ī and his brother Abu'l-'Abbās - Abū-ʿAbdallāh aš-Šīʿī, al-Ḥusain Ibn-Aḥmad -911; Abu-'l-ʿAbbās Muḥammad -911 (Ismaili texts and translations series, 2021)