G. E. Morales, E. O. Lopez, C. Castro-Campos, D. J. Charles, and Y. N. Mezquita-Hoyos, “Contributions to the Cognitive Study of Facial Recognition on Down Syndrome: A New Approximation to Exploring Facial Emotion Processing Style”, J. Intellect. Disabl. Diagn. Treat., vol. 2, no. 2, pp. 124–132, Sep. 2014.