This article just appeared:
Adiel Schremer, “Midrash, theology, and history: two powers in heaven revisited,” Journal for the Study of Judaism in the Persian, Hellenistic and Roman Period, 39 no 2 (2008): 230-254.
If you are a student or faculty (or have a college or university library card) your library should enable you to get this article in PDF. Some public libraries also give access to the ATLA Religion database or JSTOR, through which you can get this. I haven’t read it yet, but I will be downloading it soon.
