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Reefmann, Nadine; Bütikofer Kaszas, Franziska; Wechsler, Beat; Gygax, Lorenz (2009). Ear and tail postures as indicators of emotional valence in sheep. Applied animal behaviour science, 118(3-4), pp. 199-207. Amsterdam: Elsevier 10.1016/j.applanim.2009.02.013
