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Correia Caeiro, Catia and Waller, Bridget and Burrows, Anne (2013) The Cat Facial Action Coding System manual (CatFACS). Manual. University of Portsmouth.
Mannion, C. J. and Mills, D. S. (2013) Injuries sustained by dog bites. British Journal of Oral and Maxillofacial Surgery, 51 (4). pp. 368-369. ISSN 0266-4356