AWAAD, Mohamed E. A.; 						ELMULATHUM, Nagat A. M.; 						ELAMIN, Abbas E. M..
 Estimation of supply and demand functions of the major food security crops in the Sudan (1974- 2004).
<strong>Gezira Journal of Agricultural Science</strong>, [S.l.], v. 5, n. 2, july 2007.
ISSN 1728-9556. Available at: &lt;<a href="http://37.60.236.48/index.php/gjas/article/view/453" target="_new">http://37.60.236.48/index.php/gjas/article/view/453</a>&gt;. Date accessed: 03 june 2026.