By Raub Steffen   Rüling Charles-Clemens   in Journal of Information Technology

ISSN:1466-4437|16|2|113-130

Palgrave Macmillan Ltd‎(2001)‎

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By Noppeney Claus   Rüling Charles-Clemens   in GAIA - Ecological Perspectives for Science and Society

ISSN:0940-5550|1|4|226-231

oekom verlag‎(1992)‎

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