By Howarth Richard B.   in Environmental Values

ISSN:1752-7015|1|2|133-140

White Horse Press‎(1992)‎

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By Howarth Richard B.   in International Journal of Environment and Pollution

ISSN:0957-4352|15|4|386-405

Inderscience Publishers‎(2001)‎

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By Howarth Richard B.   in International Journal of Sustainable Development

ISSN:0960-1406|6|1|87-97

Inderscience Publishers‎(2004)‎

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By Zografos Christos   Howarth Richard B.   in Sustainability

ISSN:2071-1050|2|11|3399-3417

MDPI‎(2010)‎

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