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Anna Ingeborg Petursdottir, Rakel Dögg HafliÐadóttir
J Appl Behav Anal. 2009 Fall; 42(3): 685–690. doi: 10.1901/jaba.2009.42-685
Joline Ramirez, Ruth Anne Rehfeldt
J Appl Behav Anal. 2009 Winter; 42(4): 801–805. doi: 10.1901/jaba.2009.42-801
Hang Wu, L Keith Miller
J Appl Behav Anal. 2007 Fall; 40(3): 583–586. doi: 10.1901/jaba.2007.40-583