By Mertens Sven K.   Gsell Heiko   in International Journal of Technology Intelligence and Planning

ISSN:1740-2832|2|1|33-45

Inderscience Publishers‎(2006)‎

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By Gsell Heiko   Thoben Klaus-Dieter   in International Journal of Product Development

ISSN:1477-9056|8|2|211-223

Inderscience Publishers‎(2009)‎

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