By Hwang Hark   Ko Young Dae   Yune Sang Hun   Ko Chang Seong   in International Journal of Services and Operations Management

ISSN:1744-2370|5|6|758-773

Inderscience Publishers‎(2009)‎

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By Ko Young Dae   Jung Seung Hwan   Kim Sung Hee   Lee Sung Wook   in Sustainability

ISSN:2071-1050|10|2|429-429

MDPI‎(2018)‎

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