Oriental Institute Research Associate Bruce Williams recently published an important new article on relations between Egypt and Nubia in Journal of Ancient Egyptian Interconnections 6 (2014). The article is available online via subscription.
Bruce Beyer Williams. "Some Geographical and Political Aspects to Relations between Egypt and Nubia in C-Group and Kerma Times, ca. 2500 – 1500 B.C." Journal of Ancient Egyptian Interconnections 6 (2014), 62-75