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Kjaer, J B; Würbel, Hanno; Schrader, L (2015). Perseveration in a guessing task by laying hens selected for high or low levels of feather pecking does not support classification of feather pecking as a stereotypy. Applied animal behaviour science, 168, pp. 56-60. Elsevier 10.1016/j.applanim.2015.04.014
