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出 处:American Journal of Economics. 2013 ;3(1):23-26.doi:10.5923/j.economics.20130301.05
出 版 社:Scientific & Academic Publishing Co.
文 章 ID:1020631681
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出 处:American Journal of Economics. 2012 ;2(4).doi:10.5923/j.economics.20120001.22
出 版 社:Scientific & Academic Publishing Co.
文 章 ID:1021839979
作 者:Habibu Mohammed Umar ;Nana Mohammed ;Fatima Binta Yusuf
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出 版 社:The International Institute for Science, Technology and Education (IISTE)
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出 版 社:The International Institute for Science, Technology and Education (IISTE)
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