Who are the most prominent scholars whose قول (saying/opinion) is considered authoritative in other schools of Islamic jurisprudence, such as the Hanbalis, Malikis, Hanafis, and Zahiris, by analogy with what you mentioned in Fatwa No. (194735) concerning the Shafi'i school?

The accredited books vary among the different schools of thought. For the Hanafi school, they include: Al-Ikhtiyar li-Ta'lil al-Mukhtar, Al-Bahr al-Raiq, and Radd al-Muhtar. For the Maliki school: Al-Sharh al-Saghir by Al-Dardir, Hashiyat al-Dasuqi, and Sharh al-Kharshi 'ala Mukhtasar Khalil. As for the Shafi'i school: Nihayat al-Muhtaj by Al-Ramli, and Tuhfat al-Muhtaj by Ibn Hajar al-Haytami. In the Hanbali school: Al-Tanqih, Al-Muntaha, and Al-Iqna'. The Zahiri school, however, refers to Ibn Hazm's Al-Muhalla.