ArchiveVolume 7, Issue 2, December 2019
Changyou Wang, Wei Wei, Qiang Yang, Yonghong Li
Pages: 13-18     Published Online: Dec. 11, 2019
DOI: 10.11648/j.ajea.20190702.11        Views 163      Downloads 59
Alioune Aidara Diouf, Souleymane Sene, Bassirou Lo
Pages: 19-24     Published Online: Dec. 11, 2019
DOI: 10.11648/j.ajea.20190702.12        Views 173      Downloads 59
Ibrahim Goni
Pages: 25-33     Published Online: Dec. 17, 2019
DOI: 10.11648/j.ajea.20190702.13        Views 164      Downloads 65
Sitotaw Eshete, Yimenu Yeshiwas
Pages: 34-38     Published Online: Dec. 27, 2019
DOI: 10.11648/j.ajea.20190702.14        Views 150      Downloads 59
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