MUSTAFA, Mohammed Elhaj.
 The Determinants of Unemployment in Sudan: A Co-integration and Error Correction Model Analysis (1981-2011).
<strong>Gezira Journal of Economic and Social Sciences</strong>, [S.l.], v. 4, n. 1&amp;2, june 2013.
ISSN 1858-6023. Available at: &lt;<a href="http://37.60.236.48/index.php/gjess/article/view/256" target="_new">http://37.60.236.48/index.php/gjess/article/view/256</a>&gt;. Date accessed: 03 june 2026.