Cendón, María Laura, Javier Sanz-Cañada, and Delio Lucena-Piquero. 2014. “Differential Quality and technical/Managerial Advice Relationships in Andalusian (Spain) Olive Oil Protected Designations of Origin”. Spanish Journal of Agricultural Research 12 (4), 869-88. https://doi.org/10.5424/sjar/2014124-6026.