You may want to look at: "Ezra and Qoheleth Manuscripts from Qumran (4QEzra, 4QQoha,b)," pp. 139-157 in Priests, Prophets, and Scribes: Essays on the Formation and Heritage of Second Temple Judaism in Honour of Joseph Blenkinsopp, ed. Eugene Ulrich et al. Journal for the Study of the Old Testament Supplement Series 149. Sheffield: JSOT Press, 1992. E. Ulrich