C. L. Delgado-Chavero, E. Zapata-Márquez, J. M. García-Casco, and A. Paredes-Torronteras, “Statistical model for classifying the feeding systems of Iberian pigs through Gas Chromatography (GC-FID) and Isotope Ratio Mass Spectrometry (GC-C-IRMS)”, Grasas aceites, vol. 64, no. 2, pp. 157–165, Jun. 2013.