Miriam Frenkel, The Compassionate and Benevolent: The Leading Elite in the Jewish Community of Alexandria in the Middle Ages (in Hebrew) (Jerusalem: Ben-Zvi Institute for the Study of Jewish Communities in the East, 2006).
for edition see
Doc. #11, pp. 266-267
Jacob Mann, The Jews in Egypt and in Palestine under the Fâtịmid Caliphs (New York: Ktav Publishing House, 1970), vol. 2.