Ahmed Elhaj, Abu sufian, 		Abdalla, Mohammad, AND 		Abubakar AbdallaM, Haydar.
" THE EFFECT OF AREA AND SITE OF TYMPANIC MEMBRANE PERFORATIONS ON HEARING THRESHOLD AMONG SUDANESE PATIENTS" <em>Gezira Journal of Health Sciences</em> [Online], Volume 4 Number 1 (1 January 2005)