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- [8] Valuing the environment through contingent evaluation. Hanemann,et al. Journal of Econometrics . 1994
- [9] Measuringvaluesofextramarketgoods:areindirectmeasuresbiased?. Bishop,R.C.,T.A Herberlein. Ame.J.Agri.Econ . 1979
- [10] Sample selection bias as a specification error. Heckman. J. Econometrica . 1979