1. Williams, M. A. J. & Adamson, D. A. in The Sahara and the Nile (eds Williams, M. A. J. & Faure, H.) 281–304 (Balkema, Rotterdam, 1980).
2. Gasse, F., Rognon, P. & Street, F. A. in The Sahara and the Nile (eds Williams, M. A. J. & Faure, H.) 361–400 (Balkema, Rotterdam, 1980).
3. Livingstone, D. A. in The Sahara and the Nile (eds Williams, M. A. J. & Faure, H.) 339–359 (Balkema, Rotterdam, 1980).
4. Stanley, D. J. & Maldonado, A. Nature 266, 129–135 (1977).
5. Stanley, D. J. & Maldonado, A. Sediment. Geol. 23, 37–75 (1979).