By Mandry Torsten   Pernul Günther   Röhm Alexander W.   in International Journal of Electronic Commerce

ISSN:1086-4415|5|2|47-60

M. E. Sharpe Inc‎(2000)‎

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By Lopez Javier   Oppliger Rolf   Pernul G³nther   in Internet Research: Electronic Networking Applications and Policy

ISSN:1066-2243|15|5|544-556

Emerald Group Publishing Ltd‎(2005)‎

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