1. Ab'Saber, A.N., in: Biological diversification in the tropics, p. 42 (G.T. Prance, ed.). New York: Columbia Univ. Press 1982; Bakker, J.P.: Acta Geog. Debrecin 7, 9 (1968);
2. Zonneveld, J.I.S.: Götting. Geog. Abh., Heft 60, 93 (1972)
3. Bibus, E.: Z. Geomorph. N.F., Suppl. 48, 79 (1983);
4. Damuth, J.E., Fairbridge, R.W.: Geol. Soc. Am. Bull. 81, 189 (1970);
5. Eden, M.J.: J. Biogeog. 1, 95 (1974);