Ø§Ù„Ø´ÙŠØ®, Ø., & Ø³ÙŠØ¯Ø§ØÙ…Ø¯, Ø. 2014 Jan 1. Ø£Ø«Ø± Ø§Ù„Ø¶Ø±Ø§Ø¦Ø¨ ØºÙŠØ± Ø§Ù„Ù…Ø¨Ø§Ø´Ø±Ø© ÙÙŠ Ø§Ù„Ù†Ø´Ø§Ø· Ø§Ù„Ø§Ù‚ØªØµØ§Ø¯ÙŠ Ø¯Ø±Ø§Ø³Ø© ØØ§Ù„Ø© Ø§Ù„Ø³ÙˆØ¯Ø§Ù† (1970-2010). Gezira Journal of Economic and Social Sciences. [Online] 5:1