By Spillmann Werner   in GAIA - Ecological Perspectives for Science and Society

ISSN:0940-5550|16|4|302-303

oekom verlag‎(2007)‎

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By Walter Felix   Spillmann Werner   in GAIA - Ecological Perspectives for Science and Society

ISSN:0940-5550|8|2|93-101

oekom verlag‎(1999)‎

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