Perez-Mesa, J. C., E. Galdeano-Gomez, and J. A. Aznar-Sanchez. “Retail Price Rigidity in Perishable Food Products: A Case Study”. Spanish Journal of Agricultural Research, Vol. 8, no. 4, Dec. 2010, pp. 895-07, doi:10.5424/sjar/2010084-1383.