By Keller R.   Eckert C. M.   Clarkson P. J.   in Journal of Engineering Design

ISSN:1466-1837|20|6|571-587

Taylor & Francis Ltd‎(2009)‎

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By Eckert C.M.   Keller R.   Clarkson P.J.   in International Journal of Technology Management

ISSN:0267-5730|55|3-4|226-237

Inderscience Publishers‎(2011)‎

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