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Journal of the Experimental Analysis of Behavior > 105 > 1 > 68 - 75
Behavioural Processes > 2012 > 90 > 2 > 217-222
Journal of Veterinary Behavior: Clinical Applications and Research > 2010 > 5 > 6 > 339-344
Journal of the Experimental Analysis of Behavior > 105 > 1 > 68 - 75
Behavioural Processes > 2012 > 90 > 2 > 217-222
Journal of Veterinary Behavior: Clinical Applications and Research > 2010 > 5 > 6 > 339-344