By Wills G.   Sim Yee-Wai   Crowder R.   Hall W.   in International Journal of Systems Science

ISSN:1464-5319|33|6|421-432

Taylor & Francis Ltd‎(2002)‎

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By Tipping E.   Bass J.A.B.   Hardie D.   Haworth E.Y.   Hurley M.A.   Wills G.   in Environmental Pollution

ISSN:0269-7491|116|1|137-146

Elsevier‎(2002)‎

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