Abeck, D., Eckert, F. and Korting, H. C. (1992) “Atypical presentation of co-existent Haemophilus ducreyi and Treponema pallidum infection in an HIV-positive male”., Acta Dermato-Venereologica, 72(1), pp. 37–38. doi: 10.2340/00015555723738.