Cortignani, R., and S. Severini. “An Extended PMP Model to Analyze farmers’ Adoption of Deficit Irrigation under Environmental Payments”. Spanish Journal of Agricultural Research 9, no. 4 (December 1, 2011): 1035-1046. Accessed August 2, 2026. https://sjar.revistas.csic.es/index.php/sjar/article/view/2428.