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Fritz, J.N., DeLeon, I.G., Lazarchick, W.N. (2004). Separating the Influences of Escape and Access to Preferred Activities on Problem Behavior Occurring in Instructional Contexts. Behavioral Interventions, 19, 159-171.
Two individuals with developmental disabilities were observed to engage in destructive behavior when demands were presented, suggesting that the behaviors were maintained by negative reinforcement