Mohammed, Hisham  M., 		Adam, Hussien, S., 		Idris, Siddig. E., AND 		Muhieldeen, Osama A..
" Determination of crop coefficients, water requirements and water productivity for maize (Zea mays L.) under central Gezira clay soil conditions, Sudan" <em>Gezira Journal of Agricultural Science</em> [Online], Volume 14 Number 2 (7 March 2016)