Khalifa, Ahmed, 		Hamed, Ibtihal, 		Ahmed, Shaker, 		Ali, Mohamed, 		Ahmed Ali, Imad-eldin, 		Heng, Lee Heng, AND 		Bakheit, Salah.
" Effects of bubbler irrigation frequency on yield and quality of foster grapefruit under Khartoum State conditions" <em>Gezira Journal of Agricultural Science</em> [Online], Volume 15 Number 2 (1 December 2017)