Delgado Agudelo, Darly Mildred, Diego Fernando Girón Timaná, Gabriel Elías Chanchí Golondrino, and Katerine Márceles Villalba. 2018. “Proposal of a Tool for the Estimation of Satisfaction in User Tests, from Facial Expression Analysis”. Revista Colombiana De Computación 19 (2):6-15. https://doi.org/10.29375/25392115.3438.