Martínez, Héctor, Adriana González, Gerardo Ortiz, and Katia Carrillo. 2011. “THE EFFECTS OF CONCURRENTLY TRAINING TWO RELATIONS ON HUMAN PERFORMANCE IN A CONDITIONAL DISCRIMINATION TASK”. Mexican Journal of Behavior Analysis 1 (2):297-320. https://doi.org/10.5514/rmac.v1.i2.27176.