Delgado, D. M.; Girón Timaná, D. F.; Chanchí, G. E.; Márceles Villalba, K. Estimate of the Satisfaction Attribute in User Tests from Facial Expression Analysis. rev.ing.univ.Medellin 2019, 19 (36), 13-28. https://doi.org/10.22395/rium.v19n36a1.