N.A.El-Dib, "Changing Pattern of Intestinal Parasites in Egypt ", (5th Annual Congress of the Egyptian Society of Tropical Medicine Infectious, and Parasitic Disease, , Sheraton Hotel, Alexandria, 10 June, 1998.
J.A.Ahmed, N.A.El-Dib, and S. A. El-Rasheed, "Technique For Parasite Detection in Sludge. ", Annual Scientific Conference of the Egyptian Society of Parasitology, Faculty of Medicine, Cairo University, Cairo, 20 November, 1997.
N.A.El-Dib, "Man, River and Parasitic Disease. ", The First Scientific Congress on Science in Service of Sustained Development in Nile Basin Countries , Ministry of Agriculture, Dokki, Cairo, 22 May, 1995.
M.K.Sobhy, G.A.Bassioni, G.H.Salem, N.A.El-Dib, S.M.El-Naggar, and A.I.Younes, "Experimental infection of Cryptosopridium spp. oscyst in mice. ", 15th Scientific Congress of the Egyptian Society of Basic Medical Sciences, Faculty of Medicine, Cairo University, Cairo, January, 1993.
M.K.Sobhy, N.A.El-Dib, S.M.E.Fahmy, and S.M.El-Naggar, "Reliability of IHA test in the diagnosis of echinococcosis. ", 15th Scientific Congress of the Egyptian Society of Basic Medical Sciences, Faculty of Medicine, Cairo University, Cairo, January, 1993.