↑ H. Kemal l Dine, L. Franchet: Les dépots de jarresdu désert de Lybie, in: Revue scientifique 65 1927), pp.596-600. ↑ Frank Förster: Beyond Dakhla: The Abu Ballas Trail in the Libyan Desert (SW Egypt), In: Frank Förster, Heiko Riemer: Desert Road Archaeology in Egypt and Beyond, Cologne 2013, ISBN 9783927688414, pp.299-314. ↑ F. Hendriks; E. Schrank, The marine Abu Ballas formation of southern Egypt: a clay-mineralogic and microfloral reconstruction of the Aptian paleoclimate, Journal of African Earth Sciences, (1990) Volume 10, Issue 3, pp.471-481. ↑ Rudolf Kuper, Sahel in Egypt: environmental change and cultural development in the Abu Ballas area, Libyan Desert.