ArchiveVolume 8, Issue 1, March 2020
Partha Pratim Das
Pages: 1-5     Published Online: Jan. 31, 2020
DOI: 10.11648/j.ajop.20200801.11        Views 385      Downloads 103
Ali Husainat, Warsame Ali, Penrose Cofie, John Attia, John Fuller, Abdalla Darwish
Pages: 6-26     Published Online: Feb. 24, 2020
DOI: 10.11648/j.ajop.20200801.12        Views 342      Downloads 423
Christian Ngouo Tchinda, Jean Roger Bogning
Pages: 27-32     Published Online: Apr. 13, 2020
DOI: 10.11648/j.ajop.20200801.13        Views 262      Downloads 65
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