1. Borteau-Roussel, P.: Goundou. Handbook of Tropical Dermatology and Medical Mycology, ed. by R. D. G. Ph. Simons, Vol.I/9, pp. 316?330. Amsterdam: Elsevier 1952.
2. Durel, P., L.-J. Borel, A. Fribourg-Blanc et G. Niel: Propositions pour un diagnostic s�rologique moderne de la syphilis. Bull. Soc. fran�. Derm. Syph. (Paris)72, 501?515 (1965).
3. Eliassow, A., and G. A. Spencer: Dermatological syphilis in non-whites, particularly in the negro. Handbook of Tropical Dermatology and Medical Mycology, Vol. I, pp. 225?255. ed. by R. D. G. Ph. Simons. Amsterdam: Elsevier 1952.
4. Ferreira-Marques, J.: Contribution � l'�tude des maladies ven�riennes et cutan�es � Addis Abeda. Derm. Tropica3, 139?151 (1964).
5. Grin, E. I.: Epidemiology and control of endemic Syphilis. Wld Hlth Org. Monogr. Ser. No. 11 (1953).