Ribes, E., Domínguez, M., Tena, O. and Martínez, H. 2011. Differential effect of choosing among stimulus contingencies descriptive texts before and after the matching response in a conditional discrimination task. Mexican Journal of Behavior Analysis. 18, 1y2 (Jan. 2011), 31–59. DOI:https://doi.org/10.5514/rmac.v18.i1y2.23373.