By Klötzli Frank A.   in GAIA - Ecological Perspectives for Science and Society

ISSN:0940-5550|1|2|121-123

oekom verlag‎(1992)‎

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By Klötzli Frank   in GAIA - Ecological Perspectives for Science and Society

ISSN:0940-5550|6|4|302-309

oekom verlag‎(1997)‎

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