J. R. López-Aguilar, G. Valerio-Alfaro, J. A. Monroy-Rivera, L. A. Medina-Juárez, M. O’Mahony, and O. Angulo, “Evaluation of a simple and sensitive sensory method for measuring rancidity in soybean oils”, Grasas aceites, vol. 57, no. 2, pp. 149–154, Jun. 2006.