Hanafi
The sources give no view for it here.
الاستنجاء بالروث والعظم
هل يُجزئ الاستنجاء بالروث والعظم؟
Each school’s answer
In our wordsHanafi
Not stated in the sources
Maliki
Not stated in the sources
Shafi'i
Not stated in the sources
Hanbali
Not stated in the sources
The texts
واختلفوا هل يجزي الاستنجاء بالروث والعظم؟ واختلفوا هل يجزي الاستنجاء بالروث والعظم؟
«الإفصاح», Ibn Hubayra p. 32
From the schools’ own books
Maliki
The sources give no view for it here.
Shafi'i
The sources give no view for it here.
Hanbali
The sources give no view for it here.
What is «in our words» is our standard wording; the books’ texts stay as they are.