ArchiveVolume 6, Issue 5, October 2017
Godwin Essang Esu, Johnson Akpan Atan
Pages: 59-66     Published Online: Dec. 25, 2017
DOI: 10.11648/j.jwer.20170605.11        Views 982      Downloads 54
Jiahui Wang, Qian Guo
Pages: 67-70     Published Online: Jan. 2, 2018
DOI: 10.11648/j.jwer.20170605.12        Views 965      Downloads 41
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