By Alpar Paul   Donthu Naveen   in International Journal of Electronic Business

ISSN:1470-6067|5|3|243-262

Inderscience Publishers‎(2007)‎

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By Porembski Marcus   Breitenstein Kristina   Alpar Paul   in Journal of Productivity Analysis

ISSN:0895-562X|23|2|203-221

Springer Publishing Company ‎(2005)‎

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By Alpar Paul   Porembski Marcus   Pickerodt Sebastian   in International Journal of Electronic Commerce

ISSN:1086-4415|6|1|53-74

M. E. Sharpe Inc‎(2001)‎

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