Flores, Carlos, Rebeca Mateos, Sergio Villanueva, and Rene Ortiz. 2009. “Stimulus Control in Temporally Defined Schedules: The Role of Cancellation or Maintenance of Signals Correlated With Reinforcement and Extinction”. Acta Comportamentalia 15 (1). https://revistas.unam.mx/index.php/acom/article/view/14510.