He is one of the most important Geonim ever worked as Dezisor ( halakhic monographs, responsa ) and wrote mainly in Arabic.
His Mishnah commentary is lost.
Literature (selection )
- Solomon Judah Rapoport: Bikkurei ha - ittim, 1830/31
- Abraham Harkavy: studies and communications Petersburg 1879
- J. Müller: Introduction to the Responsa of the Babylonian Geonim, 1891
- Louis Ginzberg: Geonica, 1909
- JN Epstein: The gaonäische comment to order Tohoroth, 1916
- Simon Dubnow: World history of the Jewish people, Berlin 1925 et seq Bd.III
- Salomon Wininger: 1925 ff, Vol II, Article Hai
- Samuel Atlas: Article HAJ GAON, in: Jewish Encyclopedia, Berlin 1927, Vol II
- B. Lewin: Ozar hageonim, 1928