Jiménez-Guerrero, J. F., J. C. Gázquez-Abad, R. Huertas-García, and J. A. Mondéjar-Jiménez. “Estimating Consumer Preferences for Extrinsic and Intrinsic Attributes of Vegetables. A Study of German Consumers”. Spanish Journal of Agricultural Research, Vol. 10, no. 3, June 2012, pp. 539-51, doi:10.5424/sjar/2012103-342-11.