Kido, A., Seidl, A. and Loomis, J. (2005) “Panel estimators that combine travel cost and contingent behavior data sets for evaluating protected areas”, Agricultura, Sociedad y Desarrollo, 2(2), pp. 75–82. Available at: https://www.revista-asyd.org/index.php/asyd/article/view/1043 (Accessed: 16 April 2026).