By Suter Stefan   Walter Felix   in Journal of Transport Economics and Policy (JTEP)

ISSN:0022-5258|35|3|381-397

Journal of Transport Economics and Policy‎(2001)‎

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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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