ArchiveVolume 4, Issue 6, December 2019
Siyouri Hind, Hougua Ben Ahmed
Pages: 98-104     Published Online: Dec. 6, 2019
DOI: 10.11648/j.ijecs.20190406.11        Views 369      Downloads 104
Qiu Hong Chao
Pages: 105-110     Published Online: Dec. 10, 2019
DOI: 10.11648/j.ijecs.20190406.12        Views 389      Downloads 152
Jannike Vik, Christin Tønseth
Pages: 111-119     Published Online: Dec. 11, 2019
DOI: 10.11648/j.ijecs.20190406.13        Views 373      Downloads 129
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