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Hintze, Sara; Smith, Samantha; Patt, Antonia; Bachmann, Iris; Würbel, Hanno (2016). Are Eyes a Mirror of the Soul? What Eye Wrinkles Reveal about a Horse’s Emotional State. PLoS ONE, 11(10), pp. 1-15. Public Library of Science 10.1371/journal.pone.0164017
