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Research in Transportation Economics > 2014 > 48 > Complete > 349-356
Environmental and Resource Economics > 2014 > 59 > 3 > 363-387
Ecological Economics > 2011 > 70 > 12 > 2243-2249
Ekonomia i Środowisko > 2010 > nr 1 > 167--175
Journal for Nature Conservation > 2009 > 17 > 4 > 199-211