Sayadi, Samir, Mª Carmen González Roa, and Javier Calatrava Requena. 2011. “Agrarian Landscape Preferences Study by Conjoint Analysis and Contingent Valuation Methods”. Economía Agraria Y Recursos Naturales - Agricultural and Resource Economics 4 (7):135-51. https://doi.org/10.7201/earn.2004.07.07.