A. Schult, A. Hussain, and H. Soffel, “ Palaeomagnetism of Upper Cretaceous volcanics and Nubian sandstones of Wadi Natash, SE Egypt and implications for the polar wander path for Africa in the Mesozoic”, J Geophys, vol. 50, no. 1, pp. 16-22, Oct. 1981.