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ISSN:0195-9255|20|3|381-392

Elsevier‎(2000)‎

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By Spangenberg J.H.   Hinterberger F.   Moll S.   Schutz H.   in International Journal of Sustainable Development

ISSN:0960-1406|2|4|491-505

Inderscience Publishers‎(2004)‎

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