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3. Alberni, A., Cooper, J., 2000. Application of the contingent valuation methods in developing countries. A survey. FAO Economic and Social Development Paper Number 146.
4. Willingness to pay for health insurance in developing economy. A pilot study of the informal sector of Ghana using contingent valuation;Asenso-Okyere;Health Policy,1997
5. The net benefit of saving the Asian elephant: a policy and contingent valuation study in Colombo, Sri Lanka;Bandara;Journal of Ecological Economics,2004