Fernández-Olmos, M., Rosell Martínez, J. and Espitia-Escuer, M. 2009. The relationship between product quality and transaction costs with vertical coordination in DOC [Qualified Designation of Origin] Rioja winegrape industry. Spanish Journal of Agricultural Research. 7, 2 (Jun. 2009), 281-293. DOI:https://doi.org/10.5424/sjar/2009072-419.