AU - Hamad, Mohamed Satti. AU - Yassin, Abdalla ID - 25482 OP - pp. 1-18 T1 - Investigating lexical errors and their effect on university students written performance in Sudan [Article] UL - 1 http://search.shamaa.org/fulltext.gif http://www.sustech.edu/staff_publications/20150430072230693.pdf Full text (PDF)