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Altruistic, egoistic and biospheric values in willingness to pay (WTP) for wildlife
Ojea, Elena, (2007)
VALUATION OF WILDLIFE: REVISING SOME ADDITIONAL CONSIDERATIONS FOR SCOPE TESTS
OJEA, ELENA, (2009)
Valuing local endangered species: The role of intra-species substitutes
Loureiro, Maria L., (2008)