ArchiveVolume 4, Issue 4, August 2015
Bakytkan Dauletbakov, Galym Dauletbakov
Pages: 57-63     Published Online: Jul. 15, 2015
DOI: 10.11648/j.eco.20150404.11        Views 5617      Downloads 123
Nega Muhabaw Kassie
Pages: 64-70     Published Online: Aug. 13, 2015
DOI: 10.11648/j.eco.20150404.12        Views 4583      Downloads 160
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